Grade 8 Math WORKBOOK UNIT 1 : POLYGONS. Are these polygons? Justify your answer by explaining WHY or WHY NOT???

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1 Grade 8 Math WORKBOOK UNIT 1 : POLYGONS Are these polygons? Justify your answer by explaining WHY or WHY NOT??? a) b) c) Yes or No Why/Why not? Yes or No Why/Why not? Yes or No Why/Why not? a) What is a CONCAVE polygon? Use a diagram to illustrate your definition. b) What is a CONVEX polygon? Use a diagram to illustrate your definition. Classify each of the following polygons as CONCAVE or CONVEX. a) b) c)c) d) SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 2

2 e) f) g) h) What is a diagonal? Draw ALL diagonals for each of the following polygons, how many diagonals does each polygon have? a) b) c) d) e) f) g) h) How many diagonals can be drawn in a polygon with each of the following number of sides? a) 6 sides b) 9 sides c) 14 sides Name the POLYGON which has: a) 20 diagonals? b) 9 diagonals? c) 5 diagonals? What is an interior angle? Draw a diagram to illustrate your definition. SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 3

3 Calculate the sum of the interior angles for each of the following polygons. a) HEXAGON b) DECAGON c) PENTADECAGON Find the number of sides each of the following polygons have if: a) the sum of the interior angles = 540 b) the sum of the interior angles = 1440 c) the sum of the interior angles = 1800 d) the sum of the interior angles = 3240 A hexagon has angles measuring 130, 115, 95, 150 and 120. Find the measure of the 6 th angle. What is an exterior angle? Draw a diagram to illustrate your definition? What is a regular polygon? Draw a diagram to illustrate your definition. SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 4

4 Identify whether each of the following polygons are REGULAR or NOT, JUSTIFY your answer for each! a) b) c) d) What is the measure of the interior angles of each of the following regular polygons? a) Regular pentagon b) Regular decagon c) Regular octagon d) Regular hexagon Which regular polygon has the following interior angle measurement? a) 108 b) 60 c) 120 d) 144 SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 5

5 Draw a circle and construct the following polygons inside each circle: ***Your circle must CIRCUMSCRIBE your polygon; this means each vertex of your regular polygon must touch the edge of the circle. a) an equilateral triangle b) a regular pentagon c) an regular decagon d) a regular octagon (a) Construct a regular pentagon (b) Construct a regular octagon with 3 cm sides. with 2 cm sides. (c) Construct an equilateral triangle with 4 cm sides. (d) Construct a regular hexagon 2 cm sides. SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 6

6 (e) Construct a SQUARE with diagonals that measure 6 cm. (f) Construct a regular heptagon with 2.5 cm sides. Complete this table. Polygon Octagon Square Decagon Pentagon Hexagon Side Length 4 cm 1.6 cm 8 m Perimeter 56 cm 45 cm Complete this table by giving the name of the regular polygon for each of the following: Side length 4.6 cm 8 cm 2.2 cm 12 dm 11.2 cm Perimeter 18.4 cm 72 cm 6.6 cm 144 dm 33.6 cm Name The loony is shaped like a regular hendecagon (11 sides), if each side measures 7mm: (a) What is the perimeter? (b) What is the measure of each interior angle? (c) What is sum of the exterior angles? If a heptagon has a perimeter of 84 cm, what is the side length? This figure was created using a rhombus with a perimeter of 16 cm, if pentagons are placed around the perimeter of the rhombus what is the perimeter of this new figure? Perimeter = SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 7

7 Calculate the PERIMETER of each regular polygon. (a) 3 cm (b) 8 cm a = 4.33cm a = 6.75cm A regular pentagon is made up of 5 congruent isosceles triangles. Find the area of the pentagon given that the area of one triangle is 14.5 cm 2. Find the area of a regular pentagon with a side length of 4 cm and an apothem of 2.75 cm. a = 2.75cm A regular octagon with a perimeter of 32 cm has an apothem of 4.83 cm Find the area of this octagon. P = 32 cm a = 4.83cm A regular hexagon has a perimeter of 30 cm and an apothem of 4.33 cm. What is area of this regular hexagon? P = 30 cm a = 4.33cm SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 8

8 The area of a regular polygon can be calculated using the formula Area = (P a) 2 P is the perimeter and a is the apothem. Complete the following table. POLYGON APOTHEM Cm PERIMETER Cm Octagon # sides: SIDE LENGTH cm AREA of POLYGON cm 2 Pentagon # sides: Decagon # sides: Hexagon # sides: Octagon # sides: Decagon # sides: Hexagon # sides: Pentagon # sides: A regular polygon has a side length of 6 cm and an apothem of 5.20cm. If the area is cm 2, which regular polygon is it? The living room floor is covered with a hexagonal rug. Each side of the rug measures 1m and the apothem measures 86.6 cm. What is the area of this rug? SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 9

9 I would like to build an octagonal gazebo for my back yard this summer, the plans I have call for the sides to be 2 m each, from the center of the gazebo to one of the sides measures 1.65 m. What is the area of the gazebo that I would like build? Calculate the area of each regular polygon using the measurements given: a] a regular octagon with sides measuring10 mm & an apothem of mm b] a regular hexagon with sides measuring 5 cm & an apothem of 4.33 cm c] a regular decagon with sides measuring 4 m & an apothem of 6.16 m d] a regular pentagon with sides measuring 8 dm & an apothem of 6.5 dm A regular polygon has 5 cm sides and an apothem of 6.04 cm. The area of this polygon is cm 2, what regular polygon is it? The area of the equilateral triangle on the right is 15.6 cm 2. Its height is 5.2 cm. What is the perimeter of this equilateral triangle? 5.2 cm SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 10

10 Complete this table [n always means # of sides in each formula]. # Total Number of # s Sum of Interior Sides Name Diagonals ANGLES Interior Angle Measure Central Angle Measure 3 triangle = SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 11

11 POLYGON CONSTRUCTION In-Class LA ***This IC LA is to be done on a SEPARATE SHEET of paper, preferably without lines. ***Be very careful when constructing polygons, you must be within 2 and 2 mm of specifications. Have a friend double check for you! ***Be sure to include all angle measurements & side lengths where required. ***Feel free to add colour to your assignment! Construct the following polygons using the side lengths [10 marks each]: a) An equilateral triangle with a perimeter of 15 cm b) A pentagon with a perimeter of 30 cm c) An octagon with a perimeter of 32 cm d) A hexagon with a perimeter of 18 cm Find the area of each REGULAR POLYGON in P ( a) ***A = 2 ***You need to find the center of the polygons you created in #2, use 2 lines of symmetry to find the center and measure the apothem with your ruler!* 20 Construct a REGULAR POLYGON with at least 20 sides. 20 SHOW YOUR WORK CHECK YOUR WORK VALIDATE YOUR WORK 12

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