DRAFT CHAPTER. Surface Area GET READY. xxx. Math Link. 5.1 Warm Up xxx. 5.1 Views of Three-Dimensional Objects xxx. 5.
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1 CHAPTER 5 Surface Area GET READY Math Link xxx xxx 5.1 Warm Up xxx 5.1 Views of Three-Dimensional Objects xxx 5.2 Warm Up xxx 5.2 Nets of Three-Dimensional Objects xxx 5.3 Warm Up xxx 5.3 Surface Area of a Prism xxx 5.4 Warm Up xxx 5.4 Surface Area of a Cylinder xxx Graphic Organizer Chapter Review Practice Test Wrap It Up! Key Word Builder Math Games Challenge in Real Life Answers xxx xxx xxx xxx xxx xxx xxx xxx
2 Three-Dimensional Objects three-dimensional (3-D) an object that has length, width, and height you can describe a 3-D object by its faces, edges, and vertices face flat or curved surface edge line segment where two faces meet vertex point where three or more edges meet 1. Write the name and the number of edges, faces, and vertices for each object. Object Name Faces Edges Vertices Circles radius the distance from the centre of the circle to the outside edge r shows the radius the radius is half the diameter: r = d 2 or r = d 2 diameter the distance across a circle through its centre d shows the diameter the diameter is twice the radius: d = 2 r or d = 2r circumference the distance around a circle (the perimeter) C shows the circumference C = 2 π r or C = π d π is about 3.14 area the number of square units needed to cover a two-dimensional shape A shows the area r 2 means r r A = π r 2 2 or A = πr C d r 2 MHR Chapter 5: Surface Area
3 2. Find the circumference of each circle to the nearest tenth (one decimal place). a) 6 cm b) 2 cm C = π d C = 2 π r = 3.14 = 2 = cm = 3. Find the area of each circle to the nearest tenth (one decimal place). a) 2 cm b) 5 cm A = π r 2 A = π r r = = cm 2 Area Formulas h w h Area of a rectangle = l w l b Area of a triangle = b h 2 4. Find the area of each shape. Area is measured in square units. a) b) 6 cm 9 cm A = b h 2 = 2 = h = 5.5 cm b = 10 cm A = b h = = Get Ready MHR 3 b Area of a parallelogram = b h
4 City Planning When city planners design communities, they think about many things, such as: types of buildings width of streets where to put bus stops Imagine you are a city planner for a miniature community. miniature a small version of something 1. A community needs different buildings. For example, food stores, banks, and hospitals are often on the main street of a community. Use the table to organize information about the buildings a community needs. Type of Building Where the Building Is Located in the Community Shapes of Its Faces Bank main street square, rectangle Discuss your answers to #1 with a partner. Then, share your ideas with the class. 2. What else does a community need? (e.g., streets, fire hydrants, and telephone wires) 3. Imagine you are in an airplane. Using grid paper, sketch part of an aerial view of a community. Draw the buildings, roads, and any other features from #2 that are important. Aerial means from the air or from above. 4 MHR Chapter 5: Surface Area
5 5.1 Warm Up 1. Draw a square and a rectangle. a) square b) rectangle Use isometric dot paper to make it easier to draw 3-D shapes. Follow the steps to draw each solid. 3 4 a) cube b) rectangular prism 3. Draw the top, front, and side view of your cube and rectangular prism. a) cube b) rectangular prism top front side top front side 4. Circle the diagram that shows a 90 clockwise rotation. a) b) 5.1 Warm Up MHR 5
6 5.1 Views of Three-Dimensional Objects A 3-D object has length, width, and height. Working Example 1: Draw and Label Top, Front, and Side Views Draw the top, front, and side view of each item. Label each view. a) Tissue box Solution top front side (end of the box) b) Compact disc case Solution top Draw the top, front, and side views of this object. top front side 6 MHR Chapter 5: Surface Area
7 Working Example 2: Sketch a Three-Dimensional Object When Given Views An object made of six blocks has these views. Sketch the object. top front side Solution Sketch the object on isometric paper. Draw the same object on the grid. An object is made using five blocks. The top, front, and side views are shown. Sketch the object on isometric dot paper. top front side 5.1 Views of Three-Dimensional Objects MHR 7
8 Working Example 3: Predict and Draw the Top, Front, and Side Views After a Rotation The diagrams show the top, front, and side views of a computer tower. top front side Rotate the computer tower 90 clockwise on its base. top 90 a) Which view will become the new front view after the rotation? Solution The side view will become the new front view after rotation. b) Label the top, front, and side views after rotating the tower. Solution 8 MHR Chapter 5: Surface Area
9 Stand a book on your desk. a) Draw the top, front, and side views. b) Rotate the book 90 clockwise around its spine. What will the top, front, and side views look like? The position after the rotation. The view after the rotation. The view after the rotation. view will only change its view will become the side view will become the front spine c) Draw the top, front, and side views after rotating the book. top front side 5.1 Views of Three-Dimensional Objects MHR 9
10 1. front top side Are these views of a book correct? Circle YES or NO. Give one reason for your answer. 2. Draw and label the top, front, and side views. a) b) top front side top front side 10 MHR Chapter 5: Surface Area
11 3. A B C D E F G a) Circle the top view. b) Put a square around the front view. c) Put an X on the side view. 4. Draw each 3-D object using the views. a) top front side b) top front side 5. Circle the object that has this front view after a rotation of 90 clockwise onto its side. set of books Front view CD rack 5.1 Views of Three-Dimensional Objects MHR 11
12 6. A microwave has these views. top front side Turn the microwave 90 counterclockwise. Draw each new view. top front side 7. Choose two 3-D objects from your classroom. Draw the top, front, and side views of each one. Object 1: top front side Object 2: top front side 12 MHR Chapter 5: Surface Area
13 8. Draw the top, front, and side views for each. a) You can make the shapes out of blocks before you draw them. top front side b) top front side c) top front side 5.1 Views of Three-Dimensional Objects MHR 13
14 a) Choose one of the important buildings from your community in the Math Link on page xx. Name of building: Sketch a 3-D view of the building. b) Draw and label the top, front, and side views. top front side 14 MHR Chapter 5: Surface Area
15 5 Chapter Review Key Words Unscramble the letters for each puzzle. Use the clues to help you. Puzzle Clues Solution 1. E T N a flat diagram you can fold to make a 3-D object 2. U S F A R E C E R A A the sum of the areas of the faces of an object (2 words) 3. I R H T G R P M I S a prism with sides perpendicular to its bases (2 words) 4. E C N I Y D R L a 3-D object with two parallel circular bases 5. I R A G N R U A L T S I M R P 6. L E U C A A N R G T R I R M S P a 3-D object with two parallel triangular bases (2 words) a 3-D object with two parallel rectangular bases (2 words) 5.1 Views of Three-Dimensional Objects, pages xx xx 7. Draw and label the top, front, and side views for these objects. a) b) top front side top front side Chapter Review MHR 47
16 8. Draw each 3-D object on the isometric grid. top front side a) b) top front side 9. The diagram shows the top, front, and side views of a filing cabinet. top front side Turn the cabinet 90 clockwise. Draw the top, front, and side views after the turn. top front side 48 MHR Chapter 5: Surface Area
17 5.2 Nets of Three-Dimensional Objects, pages xx xx 10. Name the object formed by each net. a) b) c) d) 11. Draw the net for each object. a) b) COOKIES SOUP Chapter Review MHR 49
18 5.3 Surface Area of a Prism, pages xx xx 12. What is the surface area of the object? This object is a There are. All the faces are the same size. faces. 12 cm 12 cm 12 cm Draw and label one face. Area of one face: Surface Area (S.A.) = 6 = 13. Calculate the surface area of the rectangular prism. net of rectangular prism: 10 mm Draw and label the dimensions for each view. top or bottom front or back ends 27 mm 42 mm Find the area of each view: Area of top and bottom Area of front and back = 2 = = 2 = Area of two ends = 2 Surface Area = (area of front and back) + (area of top and bottom) + (area of ends) = = = 50 MHR Chapter 5: Surface Area
19 14. a) Find the surface area of each triangular prism. 8.5 cm 6 cm Label the dimensions from each view. 6 cm 2 cm triangle small rectangle (two are the same) large rectangle cm 6 cm 8.5 cm cm cm cm Area of triangle: Area of small rectangle: Area of large rectangle: S.A. = (2 area of triangle) + (2 area of small rectangle) + (area of large rectangle) = (2 ) + (2 ) + = + + = b) 10 cm Area of triangle: Area of rectangle (three are the same): 50 cm 8 cm 12 cm S.A. = (2 area of triangle) + (3 area of rectangle) = ( ) + ( ) = Chapter Review MHR 51
20 5.4 Surface Area of a Cylinder, pages xx xx 15. Find the surface area of the cylinder. 2 m r = d = h = Formula 5.5 m Substitute Solve 16. The candle on Kay s table has a diameter of 3.4 cm and is 7 cm tall. Calculate the surface area. 7 cm 3.4 cm Sentence: 52 MHR Chapter 5: Surface Area
21 5 Practice Test For #1 to #5, circle the best answer. 1. The shape of the top view of this container shows a A circle B square C triangle D rectangle 2. One face on a cube has an area of 50 cm 2. What is the surface area of the cube? A 350 cm 2 B 300 cm 2 C 200 cm 2 D 150 cm 2 3. What 3-D object has a net like this one? A cube B cylinder C triangular prism D rectangular prism 4. What is the surface area of this box? A 550 mm 2 B 900 mm 2 C 1100 mm 2 D 1800 mm 2 CRACKERS cube 18 mm 5 mm 20 mm 5. What is the surface area of a cylinder that is 30 cm long and has a radius of 4 cm? A cm 2 B cm 2 C cm 2 D cm 2 Short Answer 6. Label the top, front, and side views. Practice Test MHR 53
22 7. An object may have more than one net. Draw two different nets for this cube. Net 1: Net 2: 8. A DVD case is 14 cm long, 12 cm wide, and 1 cm thick. Calculate the surface area to the nearest tenth (one decimal place). Draw and label the dimensions for each view. top front or back sides 14 cm 12 cm 1 cm Calculate the area of each view. Sentence: 54 MHR Chapter 5: Surface Area
23 9. Find the surface area of the cylinder. Use the formula S.A. = 2 (π r 2 ) + (π d h) r = 7 mm A = π r 2 A = π r 2 A = π d h h = 4.5 mm Formula S.A. = 2 (π r 2 ) + (π d h) Substitute Solve S.A. = Create your miniature community! Work in a group to draw an aerial view for your community. a) In the table below, list the names of the students in your group the names of the two buildings that each student sketched in the Math Link on page xx. Student Building 1 Building 2 Practice Test MHR 55
24 b) List the buildings that a community needs. Police station,,,,,. c) What buildings from part b) are missing from the table in part a)? d) Each student must choose a building from the list in part b). Each student must: make a 3-D sketch on a sheet of isometric grid paper draw and label the net, including dimensions calculate the surface area of the walls and roof on a separate piece of paper e) Draw the aerial view of your community with your group. Write a description. Check off the list as you complete each part: design all the required buildings Aerial means the top view. Each student has done: a 3-D sketch a net the surface area calculations for one new building (check each other s work) streets to travel through the community environmental areas such as water sources and parks a written description of the community 56 MHR Chapter 5: Surface Area
25 Use the clues to write the key words in the crossword puzzle. Across The line segment where two faces meet. Down 1. The number of square units needed to cover a 3-D object The point where three or more edges meet The flat or curved surface of a prism Key Word Builder MHR 57
26 Math Games Let s Face It! Play Let s Face It! with a partner or in a small group. Rules: Remove the jacks, queens, kings, and jokers from the deck of cards. The aces equal 1. Take turns dealing the cards. Choose someone to deal first. Shuffle the cards and deal three cards, face up, to each player. The values of the cards are the dimensions of a rectangular prism. Calculate the surface area of your rectangular prism using pencil and paper. If you calculate your surface area correctly, you get a point (check each other s work). The player with the greatest surface area scores an extra point for that round. If there is a tie, each of the tied players scores a point. The first player to reach ten points wins the game. If there is a tie, continue playing until one person is ahead. If a player makes a mistake calculating the surface area and you catch it, you get an extra point! deck of playing cards calculator per student My cards are a 5 of clubs, a 3 of hearts, and an 8 of spades. My rectangular prism has edges of 5 cm, 3 cm, and 8 cm. 3 cm 5 cm 8 cm Play a different version using these rules: Deal two cards to each player. Use the cards to describe the size of a cylinder. The first card gives the radius of each circle. The second card gives the height of the cylinder. Use a calculator to find the surface area of your cylinder. Use the formula S.A. = 2 (π r 2 ) + (π d h). Award points and decide the winner the same way as before. My cards are a 4 of clubs and a 6 of clubs. The radius of each circle is 4 cm. The height of the cylinder is 6 cm. 4 cm 6 cm 58 MHR Chapter 5: Surface Area
27 Challenge in Real Life Design a Bedroom You be the interior designer. Design your dream bedroom! Draw a design for a bedroom that is 4 m wide, 5 m long, and 2.5 m high. Use a sheet of grid paper. grid paper 1. a) You need to place at least three objects in the room. If your bed is one, what are two others? b) Draw the top view of the room on your grid paper. c) Use the chart to draw different views of your three objects., Object Top, Front, and Side Views 3-D Shape Bed Challenge in Real Life MHR 59
28 2. You need to paint the walls and ceiling of your room. a) Draw diagrams of the ceiling and walls. Label the dimensions. ceiling side walls end walls b) Find the total surface area of the walls and ceiling. Area of ceiling Area of side walls Area of end walls Total surface area: c) One can of paint covers 10 m 2 /L. How many cans do you need? total surface area = MHR Chapter 5: Surface Area = You cannot buy part of a can. Sentence:
29 Answers Get Ready, pages xx xx 1. Object Faces Edges Vertices Rectangular prism Triangular prism Cube a) 18.8 cm b) 12.6 cm 3. a) 12.6 cm 2 b) 78.5 cm 2 4. a) 27 cm 2 b) 55 cm 2 Math Link 1. Answers may vary. Example: Type of Building Where the Building Is Located in the Community Shapes of Its Faces Bank main street square, rectangle Church near houses square, rectangle, triangle School near houses square, rectangle Hospital near main roads, or highway square, rectangle Grocery store main street square, rectangle 2. Answers may vary. Example: streets, houses, fire hydrants, sewers, parks 3. Answers will vary. Example: houses school 3. a) top 2 cm 2 cm 2 cm front 2 cm b) front top 3 cm 2 cm 2 cm side 2 cm 4 cm 4 cm 2 cm 4. Part a) shows a 90 clockwise rotation. 5.1 Views of Three-Dimensional Objects, pages xx xx Working Example 1: Show You Know top front Working Example 2: Show You Know Working Example 3: Show You Know a) top front b) top, front, side c) top front side side 3 cm side side houses houses hospital 5.1 Warm Up, page x 1. a) 2 cm 2 cm 2. a) b) grocery store main street bank church b) 4 cm 3 cm farm houses houses farm field Communicate the Ideas 1. No. Answers may vary. Example: The top is labelled incorrectly as the front. Practise 2. a) top front side b) top front side 3. a) D b) A c) B Answers MHR 61
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