TEACHER GUIDE INCLUDES. Tier 1 Tier 2 Tier 3 Correlations. Diagnostic Interviews for Every Common Core Cluster

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1 TEACHER GUIDE FOR THE COMMON CORE STATE STANDARDS FOR MATHEMATICS 3 INCLUDES Tier Tier Tier 3 Correlations Diagnostic Interviews for Every Common Core Cluster Tier Lessons, Tier Prerequisite Skills, and Tier 3 Scaffolded Examples with Answers GRADE 6

2 TEACHER GUIDE Response to FOR THE COMMON CORE STATE STANDARDS FOR MATHEMATICS GRADE 6 3 Includes Tier Tier Tier 3 Correlations Diagnostic Interviews for Every Common Core Cluster Tier Lessons, Tier Prerequisite Skills, and Tier 3 Scaffolded Examples with Answers

3 Geometry Solve real-world and mathematical problems involving area, surface area, and volume. Lesson 73 CC.6.G. Algebra Area of Parallelograms Lesson 74 CC.6.G. Explore Area of Triangles Lesson 75 CC.6.G. Algebra Area of Triangles Lesson 76 CC.6.G. Explore Area of Trapezoids Lesson 77 CC.6.G. Algebra Area of Trapezoids Lesson 78 CC.6.G. Area of Regular Polygons Lesson 79 CC.6.G. Composite Figures Lesson 80 CC.6.G. Problem Solving Changing Dimensions Lesson 8 CC.6.G. Fractions and Volume Lesson 8 CC.6.G. Algebra Volume of Rectangular Prisms Lesson 83 CC.6.G.3 Figures on the Coordinate Plane Lesson 84 CC.6.G.4 Three-Dimensional Figures and Nets Lesson 85 CC.6.G.4 Explore Surface Area Using Nets Lesson 86 CC.6.G.4 Algebra Surface Area of Prisms Lesson 87 CC.6.G.4 Algebra Surface Area of Pyramids Lesson 88 CC.6.G.4 Problem Solving Geometric Measurements vi

4 LESSON 73 Algebra Area of Parallelograms OBJECTIVE Find the area of parallelograms. CC.6.G. The formula for the area of a parallelogram is the product of the base and height. The formula for the area of a square is the square of one of its sides. height = h base = b A = bh A = s side = s Find the area. Step Identify the figure. The figure is a parallelogram, so use the formula A = bh. Step Substitute 5 for b and for h. A = 5 Step 3 Multiply. A = 5 = = So, the area of the parallelogram is yd. Find the area.. Figure: parallelogram 4.7 m Formula: A = bh 3 m A = = 6. m yd mi 7 _ mi 5 yd 44 mi 3 5 yd Geometry 45

5 Algebra Area of Parallelograms CC.6.G. Find the area of the figure.. A = bh. A = 8 7 A = 6 ft 5 cm 7 cm 35 cm Find the unknown measurement for the figure. 3. square 4. parallelogram 5. parallelogram 6. parallelogram A = 8 yd s = 9 yd A = 47 in. b = 9 in. h = 3 in. A = 9.8 m b =.7 m h = 3.4 m A = yd b = 3 yd h = yd 7. parallelogram A = 0. in. b = 0.5 in. h = 0.4 in. Problem Solving 8. parallelogram A = 9 3_ 00 m b = m h = 0 m. Ronna has a sticker in the shape of a parallelogram. The sticker has a base of 6.5 cm and a height of 0. cm. What is the area of the sticker? 9. square A =,5 cm s = 35 cm 0. parallelogram A = 6.3 mm b = 7 mm h = 0.9 mm. A parallelogram-shaped tile has an area of 48 in. The base of the tile measures in. What is the measure of its height? cm 4 in. 46 Lesson 73

6 LESSON 74 Explore Area of Triangles OBJECTIVE Investigate the relationship among the areas of triangles, rectangles, and parallelograms. CC.6.G. You can use grid paper to find a relationship between the areas of triangles and rectangles. Step On grid paper, draw a rectangle with a base of 8 units and a height of 6 units. Find and record the area of the rectangle. A = 48 square units Step Cut out the rectangle. Step 3 Draw a diagonal from the bottom left corner up to the top right corner. Step 3 Cut the rectangle along the diagonal. You have made triangles. Are the triangles congruent? yes How does the area of one triangle compare to the area of the rectangle? The area of the triangle is half the area of the rectangle. If / is the length and w is the width, you can use a rectangle to find the area of a triangle. Find the area of the triangle. Area of rectangle: A = lw = 7 4 = 8 m Area of triangle: A = area of rectangle = 8 = 4 m So, the area is 4 square meters. Find the area of the triangle... 4 ft 3. 8 in. 0 in. 0 ft 9 m 7 m 6 m 4 m 40 in. 0 ft 7 m Geometry 47

7 Explore Area of Triangles CC.6.G. Find the area of each triangle mm 0 ft 6 ft 37 cm 40 mm 50 cm 30 ft 95 cm 400 mm in. 8 m 8 in. in. 6 m 30 in. 80 in. 4 m 70 in in. 30 cm 5 cm 5 cm Problem Solving 0. Fabian is decorating a triangular pennant for a football game. The pennant has a base of 0 inches and a height of 4 inches. What is the total area of the pennant? 5 in. 5 in. 45 cm 0 cm 450 cm. Ryan is buying a triangular tract of land. The triangle has a base of 00 yards and a height of 300 yards. What is the area of the tract of land? 0 in. 5,000 yd 48 Lesson 74

8 LESSON 75 Algebra Area of Triangles OBJECTIVE Find the area of triangles. CC.6.G. To find the area of a triangle, use the formula A = _ base height. height h base b Find the area of the triangle. 3 cm 7 cm Step Write the formula. Step Rewrite the formula. Substitute the base and height measurements for b and h. Step 3 Simplify by multiplying. A = bh A = 7 3 A = A = 0.5 Step 4 Use the appropriate units. A = 0.5 cm Find the area of the triangle... 7 ft 6 ft 6.5 m Write the formula. Substitute for b and h. Simplify. 3. A = bh A = 6 7 A = 0 A = 5 ft 9 in. 4 m in. A = 3 m A = 49.5 in. Geometry 49

9 Algebra Area of Triangles Find the area. CC.6.G in. 5 in. A = _ bh A = _ 5 6 A = 45 Area = 45 in. 0.6 m. m 4 ft ft m 6 ft Find the unknown measurement for the triangle. 4. A = 0.5 mi b = 0.6 mi h = 0.75 mi 5. A = 4.86 yd b = h =.8 yd 5.4 yd 6. A = 63 m b = h = m 0.5 m 7. A =.5 km b = 5 km h = km Problem Solving 8. Bayla draws a triangle with a base of 5 cm and a height of 8.5 cm. If she colors the space inside the triangle, what area does she color? 9. Alicia is making a triangular sign for the school play. The area of the sign is 558 in.. The base of the triangle is 36 in. What is the height of the triangle? cm 3 in. 50 Lesson 75

10 LESSON 76 Explore Area of Trapezoids OBJECTIVE Investigate the relationship between the areas of trapezoids and parallelograms. CC.6.G. Show the relationship between the areas of trapezoids and parallelograms. Step On grid paper, draw two copies of the trapezoid. Count the grid squares to make your trapezoid match this one. Step Cut out the trapezoids. Step 3 Turn one trapezoid until the two trapezoids form a parallelogram. Step 4 Find the length of the base of the parallelogram. Add the lengths of one shorter trapezoid base and one longer trapezoid base. Step 5 Find the area of the parallelogram. units Use the formula A = bh. Step 6 The parallelogram is made of two congruent trapezoids. So, divide by to find the area of one trapezoid = units A = 3 = 33 square 33 = 6.5 square units Find the area of the triangle.. Trace and cut out two copies of the trapezoid. Arrange them to form a parallelogram. a. Find the base of the parallelogram = 8. b. Find the area of the parallelogram, using A = bh. A = 8 4 = 3 square units c. Find the area of the trapezoid. 3 = 6 square units 8 in. 7 in. 6 in ft 5 ft 7 mm 0 ft mm 3 mm 5 in. 35 ft 4 mm Geometry 5

11 Explore Area of Trapezoids CC.6.G.. Trace and cut out two copies of the trapezoid. Arrange the trapezoids to form a parallelogram. Find the areas of the parallelogram and the trapezoids using square units. parallelogram: 4 square units; trapezoids: square units Find the area of the trapezoid in. 84 cm 40 mm yd 48 yd 3,600 yd Problem Solving 8. A cake is made out of two identical trapezoids. Each trapezoid has a height of inches and bases of 9 inches and 4 inches. What is the area of one of the trapezoid pieces? m ft 9. A sticker is in the shape of a trapezoid. The height is 3 centimeters, and the bases are.5 centimeters and 5.5 centimeters. What is the area of the sticker? 6.5 in. cm 5 Lesson 76

12 LESSON 77 Algebra Area of Trapezoids OBJECTIVE Find the area of trapezoids. To find the area of a trapezoid, use the formula Area = _ (base + base ) height. base b height h CC.6.G. base b Find the area of the trapezoid. b = 4 mm height = 5 mm b = mm Step Write the formula to find the area. A = _ (b + b )h Step Replace the variable b with 4, b with, and h with 5. A = _ (4 + ) 5 Step 3 Use the order of operations to simplify. A = _ 36 5 A = 8 5 A = 450 Step 4 Use the appropriate units. A = 450 mm Find the area.. 6 cm 8.4 cm 4 cm Write the formula. A = 5 in.. 3. Replace the variables. A = _ ( ) 8.4 Simplify. A = _ A = _ 84 cm 7 ft _ (b + b )h 7 in. 8 ft 3 in. ft A = in. A = 76 ft Geometry 53

13 Algebra Area of Trapezoids CC.6.G. Find the area of the trapezoid.. A = _ (b + b )h. A = _ ( + 7 ) 8 A = _ 8 8 A = 5 cm A = 30 ft cm cm 0.6 cm A = 0.08 cm A = 37.5 in. Find the height of the trapezoid m Area m h ft Area ft h 9 ft h = m Problem Solving m 7. Sonia makes a wooden frame around a square picture. The frame is made of 4 congruent trapezoids. The shorter base is 9 in., the longer base is in., and the height is.5 in. What is the area of the picture frame? h = ft 8. Bryan cuts a piece of cardboard in the shape of a trapezoid. The area of the cutout is 43.5 square centimeters. If the bases are 6 centimeters and 8.5 centimeters long, what is the height of the trapezoid? 63 in. 6 cm 54 Lesson 77

14 LESSON 78 Area of Regular Polygons OBJECTIVE Find the area of regular polygons. CC.6.G. In a regular polygon, all sides have the same length and all angles have the same measure. To find the area of a regular polygon, divide it into triangles. Step Draw line segments from each vertex to the center of the regular polygon. Step Examine the figure. The line segments divide the polygon into congruent triangles. This polygon is a hexagon. A hexagon has 6 sides, so there are 6 triangles. Step 3 Find the area of one triangle. Use the formula A = _ bh The base of the triangle (or one side of the hexagon) is 4 in. The height of the triangle is. in. A = 4. = 69.4 = 84.7 in.. in. Step 4 Multiply by 6, because there are 6 triangles = in. So, the area of the regular hexagon is 508. square inches. Find the area of the regular polygon.. Number of congruent triangles inside the pentagon: 5. Area of each triangle: A = = 44 = mm Area of the pentagon: 5 = 0 mm 0 m ft mm 6.5 cm 8 mm 8.3 m 4 ft 9 cm 33 m 4 ft cm Geometry 55

15 Area of Regular Polygons CC.6.G. Find the area of the regular polygon.. number of congruent triangles inside the figure: 6 area of each triangle: _ 8 7 = 8 mm area of hexagon: 68 mm yd 5.8 in ft Problem Solving 6. Stu is making a stained glass window in the shape of a regular pentagon. The pentagon can be divided into congruent triangles, each with a base of 8.7 inches and a height of 6 inches. What is the area of the window? 6.4 cm 7. A dinner platter is in the shape of a regular decagon. The platter has an area of 6 square inches and a side length of 4.6 inches. What is the area of each triangle? What is the height of each triangle? 30.5 in. 6. in. ; 7 in. 56 Lesson 78

16 LESSON 79 Composite Figures OBJECTIVE Find the area of composite figures. CC.6.G. A composite figure is made up of two or more simpler figures, such as triangles and quadrilaterals. The composite figure shows the front view of a bird house. Complete Steps 4 to find the area of the shaded region. Step Find the area of the rectangle. A = lw = 6 0 = 30 cm 8 cm Step Find the area of the triangle. A = bh = 6 8 = = 64 cm Step 3 Find the area of the square. A = s = ( 0 ) = 00 cm 0 cm 0 cm 6 cm 0 cm Step 4 Add the areas of the rectangle and triangle. Then subtract the area of the square. Shaded area = = 84 cm So, the area of the shaded region is 84 cm. Find the area of the shaded region... in. 8 in. 6 in. 0 in. 8 cm 6 cm 8 cm cm 4 cm 3 in. 38 cm Geometry 57

17 Composite Figures CC.6.G. Find the area of the figure.. area of square A = s s = 3 3 = 9 cm area of triangle A = bh 8 = = 8 cm area of trapezoid A = (b + b )h = ( + ) = 0 cm area of composite figure A = 9 cm + 8 cm + 0 cm = 37 cm. 80 ft Problem Solving 3. Janelle is making a poster. She cuts a triangle out of poster board. What is the area of the poster board that she has left? 55 in. 58 Lesson 79

18 LESSON 80 Problem Solving Changing Dimensions OBJECTIVE Determine the effect of changing dimensions on the area of a polygon by using the strategy find a pattern. CC.6.G. Amy is sewing a quilt out of fabric pieces shaped like parallelograms. The smallest of the parallelograms is shown at the right. The dimensions of another parallelogram she is using can be found by multiplying the dimensions of the smallest parallelogram by 3. How do the areas of the parallelograms compare? Read the Problem 4 cm 6 cm 5 cm What do I need to find? I need to find how the What information do I need to use? I need to use the How will I use the information? I can draw a sketch of areas of the different parallelograms compare. dimensions of the smallest parallelogram and the number by which the dimensions. are multiplied each parallelogram and calculate the areas Then I can look for patterns in my results.. Solve the Problem Sketch Multiplier Area cm 8 cm 5 cm none 3 A = 6 4 = 4 cm When the dimensions are multiplied by 3, the area is multiplied by 9.. Sunni drew a parallelogram with area 0 in.. If she doubles the dimensions, what is the area of the new parallelogram? A = 8 = 6 cm. Abe drew a square with side length 0 mm. If he draws a new square with dimensions that are half that of the previous square, what is the area of the new square? 80 in. 00 mm Geometry 59

19 Problem Solving Changing Dimensions CC.6.G. Read each problem and solve.. The dimensions of a 5-in. by 3-in. rectangle are multiplied by 6. How is the area affected? new dimensions: l = 6 5 = 30 in. w = 6 3 = 8 in. original area: A = 5 3 = 5 in. new area: A = 30 8 = 540 in. new area original area = = 36 The area was multiplied by 36.. The dimensions of a 7-cm by -cm rectangle are multiplied by 3. How is the area affected? multiplied by 9 3. The dimensions of a 3-ft by 6-ft rectangle are multiplied by _ 3. How is the area affected? multiplied by 9 4. The dimensions of a triangle with base 0 in. and height 4.8 in. are multiplied by 4. How is the area affected? multiplied by 6 5. The dimensions of a -yd by 9-yd rectangle are multiplied by 5. How is the area affected? multiplied by 6. The dimensions of a 4-in. square are multiplied by 3. How is the area affected? multiplied by 7. The dimensions of a triangle with base.5 m and height 6 m are multiplied by. How is the area affected? multiplied by The dimensions of a triangle are multiplied by _ 4. The area of the smaller triangle can be found by multiplying the area of the original triangle by what number? multiplied by 6 60 Lesson 80

20 LESSON 8 Fractions and Volume OBJECTIVE Investigate the volume of rectangular prisms with fractional edge lengths. CC.6.G. Find the volume of a rectangular prism that is _ units long, units wide, and _ units high. units units units Step Stack cubes with _ -unit side length to form a rectangular prism. Length: 5 cubes = = units Width: 4 cubes = = units Height: 3 cubes = + + = units Step Count the total number of cubes. Step 3 It takes 8 cubes with _ -unit side lengths to make unit cube. So, each smaller cube has _ 8 the volume of a unit cube. 60 cubes Divide 60 by 8 to find how many unit cubes it would take to form the prism. Write the remainder as a fraction and simplify. So, the volume of the prism is 7 _ cubic units.. Find the volume of the rectangular prism. units units units 60 8 = a. Stack cubes with _ -unit side lengths to form the prism. b. Count the cubes c. Divide by = 8 4 d. The prism has a volume of cubic units = 7 Geometry 6

21 Fractions and Volume CC.6.G. Find the volume of the rectangular prism.. 3 units units units Number of cubes with side length unit: = 6 with a remainder of = = Volume = 6 3 cubic units units 4 units 5 units unit 5 units units 4 units units units cubic units 6 cubic units 8 cubic units 8 Problem Solving 5. Miguel is pouring liquid into a container that is 4 _ inches long by 3 _ inches wide by inches high. How many cubic inches of liquid will fit in the container? 6. A shipping crate is shaped like a rectangular prism. It is 5 _ feet long by 3 feet wide by 3 feet high. What is the volume of the crate? 3 in ft 3 6 Lesson 8

22 LESSON 8 Algebra Volume of Rectangular Prisms OBJECTIVE Use formulas to find the volume of rectangular prisms with fractional edge lengths. CC.6.G. You can find the volume of a prism by using the formula V = Bh. V stands for volume, B stands for the area of the base, and h stands for the height. 5 ft yd For a rectangular prism, any face can be the base, since all faces are rectangles. 3 _ ft _ ft yd yd Find the volume of the rectangular prism. Step Multiply the area of the base by Step Find the area of the base. The base is _ ft by 3_ ft. the height. A = l w V = Bh A = _ ft 3_ ft = 83_ 4 ft V = 8 3_ 4 ft 5 ft = 43 3_ 4 ft 3 So, the volume of the rectangular prism is 43 3_ 4 ft 3. Find the volume of the cube. Step Because the length, width, and height are all equal, you can use a special formula. V = Bh = l w h V = s 3 So, the volume of the cube is 5 5_ 8 yd3. Step Substitute _ for s. V = s 3 = ( _ ) 3 = ( 5_ ) 3 V = 5_ yd 5_ yd 5_ = 5 5_ 8 yd3 yd = 5 8 yd3 Find the volume... m 5 m 50 m 3 4 m in. in. in in.3 3 _ cm _ ft cm 4 _ 6 ft cm 3 _ cm3 6,000 ft 3 30 ft Geometry 63

23 Algebra Volume of Rectangular Prisms CC.6.G. Find the volume.. V = lwh. 3. in. 9 m 4 V = in. 3 m 9 5 m in. V = m 3 4 mm 4 mm 4 mm 7 i n m m ft 4 m ft 4 7 ft ft f t 3 8 m 36 m 3 ft 4 6 ft f t in. 3 cm 3 4 m 3 in. 3 in. 48 cm 7 m 4 9 m m 3 Problem Solving 0. A cereal box is a rectangular prism that is 8 inches long and _ inches wide. The volume of the box is 00 in. 3. What is the height of the box? 7 i n c m 3. A stack of paper is 8 _ in. long by in. wide by 4 in. high. What is the volume of the stack of paper? 0 in. 374 in Lesson 8

24 LESSON 83 Figures on the Coordinate Plane OBJECTIVE Plot polygons on a coordinate plane, and use coordinates to find side lengths. CC.6.G.3 The vertices of a parallelogram are A( -, ), B( - 3, 5), C(4, 5), and D(5, ). Graph the parallelogram and find the length of side AD. Step Draw the parallelogram on the coordinate plane. Plot the points and then connect the points with straight lines. Step Find the length of side AD. Horizontal distance of A from 0: - = Horizontal distance of D from 0: 5 = 5 Points A and D are in different quadrants, so add to find the distance from A to D. + 5 = 7 units So, the length of side AD is 7 units. y B 6 5 C 4 3 A D units 5 units x Graph the figure and find the length of the given side.. Triangle JKL J( - 3, - 3), K( - 3, 5), L(5, ). Trapezoid WXYZ W( -, - 3), X( -, 3), Y(3, 5), Z(3, - 3) K J length of JK = y L 6 x X y W length of WZ = 5 3 Y Z x Geometry 65

25 Figures on the Coordinate Plane CC.6.G.. The vertices of triangle DEF are D( -, 3), E(3, - ), and F( -, - ). Graph the triangle, and find the length of side DF. Vertical distance of D from 0: 3 = Vertical distance of F from 0: - = The points are in different quadrants, so add to find the distance from D to F: 3 units units 3 + = 5 units. Graph the figure and find the length of side BC.. A(, 4), B(, - ), C( - 3, - ), D( - 3, 3) 3. A( -, 4), B(5, 4), C(5, ), D( -, ) D C B y A x y A 5 4 B 3 D C x Length of BC = Problem Solving 4. On a map, a city block is a square with three of its vertices at ( - 4, ), (, ), and (, - 4). What are the coordinates of the remaining vertex? 4 units Length of BC = 3 units 5. A carpenter is making a shelf in the shape of a parallelogram. She begins by drawing parallelogram RSTU on a coordinate plane with vertices R(, 0), S( - 3, 0), and T( -, 3). What are the coordinates of vertex U? ( - 4, - 4) (, 3) 66 Lesson 83

26 LESSON 84 Three-Dimensional Figures and Nets OBJECTIVE Use nets to represent three-dimensional figures. CC.6.G.4 Solid figures have three dimensions length, width, and height. They can be named by the shapes of their bases, the number of bases, and the shapes of their lateral faces. Identify and draw a net for the solid figure. Step Describe the base of the figure. The base is a square. Step Describe the lateral surfaces. The lateral surfaces are triangles. So, the figure is a square pyramid. Step 3 Name the shapes to be used in the net. Then make a sketch. Draw a square for the base, and four triangles for the lateral faces. Identify and draw a net for the solid figure... figure: triangular prism figure: cube, rectangular prism Geometry 67

27 Three-Dimensional Figures and Nets CC.6.G.4 Identify and draw a net for the solid figure.. Net Possible answers given.. Net figure: rectangular prism figure: cube, rectangular prism 3. Net 4. Net figure: Problem Solving square pyramid 5. Hobie s Candies are sold in triangularpyramid-shaped boxes. How many triangles are needed to make one box? figure: triangular prism 6. Nina used plastic rectangles to make 6 rectangular prisms. How many rectangles did she use? Lesson 84

28 LESSON 85 Explore Surface Area Using Nets OBJECTIVE Use nets to recognize that the surface area of a prism is equal to the sum of the areas of its faces. CC.6.G.4 The net of a solid figure shows you all of the faces or surfaces of the figure. A net can help you find the surface area of a figure. Find the surface area of the rectangular prism. in. 4 in. in. Step Make a net of the rectangular prism. The prism has 6 rectangular faces, so the net has 6 rectangles. E A C B D F Step Find the area of each face of the prism. First Way: Count the grid squares on each rectangle to find its area. Second Way: Calculate the area of each rectangle by multiplying length width. A: 8 squares 4 = 8 B: 8 squares 4 = 8 C: 4 squares 4 = 4 D: 4 squares 4 = 4 E: squares = F: squares = Step 3 Add the areas of all the rectangular faces. 8 squares 8 square inches So, the surface area of the rectangular prism is 8 square inches (in. ). Use the net to find the surface area of the prism.. 3 cm a. Find the area of each face. 4 cm A: B: 5 cm C: 0 D: 0 A E: 5 F: 5 C E D F b. Add: A + B + C + D + E + F = 94 B c. The surface area is 94 cm. Geometry 69

29 Explore Surface Area Using Nets CC.6.G.4 Use the net to find the surface area of the rectangular prism.. A B C A: 6 squares B: 8 squares. D C: 6 squares E F D: squares E: 8 squares F: squares 5 square units square units Find the surface area of the rectangular prism mm 4 in. 7 mm 3 mm 5 in. in. 6.5 ft ft 3 ft Problem Solving 0 mm 58 in. 77 ft 6. Jeremiah is covering a cereal box with fabric for a school project. If the box is 6 inches long by inches wide by 4 inches high, how much surface area does Jeremiah have to cover? 7. Tia is making a case for her calculator. It is a rectangular prism that will be 3.5 inches long by inch wide by 0 inches high. How much material (surface area) will she need to make the case? 48 in. 97 in. 70 Lesson 85

30 LESSON 86 Algebra Surface Area of Prisms OBJECTIVE Find the surface area of prisms. You can find the surface area of a figure by adding the lateral surface area to the sum of the areas of the bases. in. 8 in. 6 in. CC.6.G.4 0 in. Use a net to find the surface area. Step Draw a net. Note any faces that have equal areas. Step Both triangular bases have the same area. A 6 in. 0 in. 8 in. 6 in. in. D C B in. 6 in. Base A: A = _ bh = _ 6 8 = 4 in. Base E: A = 4 in. E Step 3 Find the areas of the rectangular faces. Face B: A = lw = 6 = 7 in. Face C: A = lw = 8 = 96 in. Face D: A = lw = 0 = 0 in. Step 4 Add the areas: A + B + C + D + E in. So, the surface area of the triangular prism is 336 square inches (in. ). Use a net to find the surface area.. 5 in. 8 in.. 3 cm 6 in. 8 cm 7 in. 6 cm 760 in. 460 cm 3. m 4. m 8 ft 5 m 8 ft 8 ft 434 m 384 ft Geometry 7

31 Algebra Surface Area of Prisms CC.6.G.4 Use a net to find the surface area.. cm 6 cm 5 cm cm 5 cm 5 cm cm A 5 cm Area of A and F = (5 ) = 0 cm Area of B and D = (6 ) = 4 cm Area of C and E = (6 5) = 60 cm S.A. = 0 cm + 4 cm + 60 cm = 04 cm B C D F E 6 cm in. 3.5 in. 4 in. 9 ft 9 ft 9 ft 8 cm 6 cm cm 0 cm 8 in. 486 f t 336 c m Problem Solving 5. A shoe box measures 5 in. by 7 in. by 4 _ in. What is the surface area of the box? 6. Vivian is working with a styrofoam cube for art class. The length of one side is 5 inches. How much surface area does Vivian have to work with? 408 in. 50 in. 7 Lesson 86

32 LESSON 87 Algebra Surface Area of Pyramids OBJECTIVE Find the surface area of pyramids. CC.6.G.4 To find the surface area of a pyramid, add the area of the base to the lateral area. The lateral area is the combined area of the triangular faces. Find the surface area of the square pyramid. Step The base is a square with side length of 6 in. Use the formula A = s to find the area. Substitute 6 for the variable s. A = 6 = 36 in. Step The lateral faces are four triangles with base of 6 in. and height of 8 in. Find the area of one triangular lateral face using the formula A = _ bh. Substitute 6 for b and 8 for _ h. A = (6)(8) = 4 in. 6 in. 6 in. 6 in. 8 in. 8 in. Step 3 Multiply by 4 to find the total lateral area. L = 4 4 = 96 in. Step 4 Add the area of the base and the lateral area. S = 36 in in. = 3 in. So, the surface area of the square pyramid is 3 square inches (in. ). Use a net to find the surface area of the square pyramid.. cm. 4 ft 9 cm 0 ft a. Area of the base: 8 cm a. Area of the base: 00 ft b. Area of one triangular lateral face: b. Area of one triangular lateral face: 54 cm 0 ft c. Total lateral area: 6 cm c. Total lateral area: 80 ft d. Total surface area: 97 cm d. Total surface area: 80 ft Geometry 73

33 Algebra Surface Area of Pyramids CC.6.G.4 Use a net to find the surface area of the square pyramid.. 7 mm 7 mm Base: A = 5 = 5 mm Face: A = (5)(7) 5 mm = 7.5 mm 5 mm S.A. = = = 95 mm. 8 cm yd 4 in. 8 cm 0 in..5 yd 6 cm 5.5 yd 80 in. Problem Solving 5. Cho is building a sandcastle in the shape of a triangular pyramid. The area of the base is 7 square feet. Each side of the base has a length of 4 feet and the height of each face is feet. What is the surface area of the pyramid? 6. The top of a skyscraper is shaped like a square pyramid. Each side of the base has a length of 60 meters and the height of each triangle is 0 meters. What is the lateral area of the pyramid? 9 ft,400 m 74 Lesson 87

34 LESSON 88 Problem Solving Geometric Measurements OBJECTIVE Solve problems involving area, surface area, and volume by applying the strategy use a formula. CC.6.G.4 Leslie stores gardening supplies in this shed shaped like a rectangular prism. What is the area of the ground covered by the shed? feet 8 feet 7 feet Read the Problem Solve the Problem What do I need to find? I need to find the area of the ground covered by the shed. What information do I need to use? I need to use the dimensions of the shed. How will I use the information? First, I will decide which measure to use. Choose the measure area, surface area, or volume that gives the area of the ground covered by the shed. Explain. area; The area covered by the shed is the same as the area of the base of the shed Choose an appropriate formula. A = l w. Then I will choose a formula I can use to calculate this measure. Finally, I will replace the variables and evaluate the formula Solve.. Leslie is covering bricks with paint. Each brick is 8 in. long, 4 in. wide, and in. high. How many square inches will Leslie paint on each brick?. Replace the variables l and w in the area formula with their values in the dimensions of the shed. l = ft w = 8 ft Evaluate the formula. A = 8 = 96 ft. Leslie s planting box is shaped like a rectangular prism. It is 60 cm long, 35 cm wide, and 40 cm high. How many cubic cm of soil will Leslie need to fill the box? in. 84,000 cm 3 Geometry 75

35 Problem Solving Geometric Measurements CC.6.G.4 Read each problem and solve.. The outside of an aquarium tank is 50 cm long, 50 cm wide, and 30 cm high. It is open at the top. The glass used to make the tank is cm thick. How much water can the tank hold? l = 50 - = 48, w = 50 - = 48, h = 30 - = 9 V = l w h = = 66,86 66,86 cm 3. Arnie keeps his pet snake in an open-topped glass cage. The outside of the cage is 73 cm long, 60 cm wide, and 38 cm high. The glass used to make the cage is 0.5 cm thick. What is the inside volume of the cage? 59,300 c m 3 3. A gift box measures 4 in. by in. by 6 in. How much wrapping paper is needed to exactly cover the box? 648 in. 4. A display number cube measures 0 in. on a side. The sides are numbered 6. The odd-numbered sides are covered in blue fabric and the even-numbered sides are covered in red fabric. How much red fabric was used? 5. The caps on the tops of staircase posts are shaped like square pyramids. The side length of the base of each cap is 4 inches. The height of the face of each cap is 5 inches. What is the surface area of the caps for two posts? 6. A water irrigation tank is shaped like a cube and has a side length of _ feet. How many cubic feet of water are needed to completely fill the tank?,00 in. in f t 3 76 Lesson 88