# 6-1 Angles of Polygons

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1 Find the sum of the measures of the interior angles of each convex polygon. 1. decagon A decagon has ten sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 10 in. 3. Find the measure of each interior angle. The sum of the interior angle measures is or pentagon A pentagon has five sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 5 in. Use the value of x to find the measure of each angle. 540 esolutions Manual - Powered by Cognero Page 1

2 4. The sum of the interior angle measures is or AMUSEMENT The Wonder Wheel at Coney Island in Brooklyn, New York, is a regular polygon with 16 sides. What is the measure of each interior angle of the polygon? Refer to the photo on page 397. The sum of the interior angle measures is or Since this is a regular polygon, it has congruent angles and congruent sides. Let x be the measure of each interior angle of a regular polygon with 16 sides. Use the value of x to find the measure of each angle The measure of an interior angle of a regular polygon is given. Find the number of sides in the polygon Let n be the number of sides in the polygon. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 150n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. 12 esolutions Manual - Powered by Cognero Page 2

3 Let n be the number of sides in the polygon. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 170n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. 9. write an equation. Then solve for x Find the value of x in each diagram. write an equation. Then solve for x Find the measure of each exterior angle of each regular polygon. 10. quadrilateral A regular quadrilateral has 4 congruent sides and 4 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. Use the Polygon Exterior Angles Sum Theorem to write an equation. 4n = 360 Solve for n. n = 90 The measure of each exterior angle of a regular quadrilateral is esolutions Manual - Powered by Cognero Page 3

4 11. octagon A regular octagon has 8 congruent sides and 8 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 8n = 360 Solve for n. n = 45 The measure of each exterior angle of a regular octagon is Find the sum of the measures of the interior angles of each convex polygon. 12. dodecagon A dodecagon has twelve sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 12 in gon A 29-gon has twenty nine sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 29 in gon A 32-gon has thirty two sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 32 in gon A 20-gon has twenty sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 20 in esolutions Manual - Powered by Cognero Page 4

5 Find the measure of each interior angle. 16. The sum of the interior angle measures is or The sum of the interior angle measures is or 360. Use the value of x to find the measure of each angle. Use the value of x to find the measure of each angle. esolutions Manual - Powered by Cognero Page 5

6 18. The sum of the interior angle measures is or The sum of the interior angle measures is or 540. Use the value of x to find the measure of each angle. Use the value of x to find the measure of each angle. esolutions Manual - Powered by Cognero Page 6

7 20. BASEBALL In baseball, home plate is a pentagon. The dimensions of home plate are shown. What is the sum of the measures of the interior angles of home plate? 22. pentagon Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 5 sides. Since all angles of a regular pentagon are congruent, the sum of the interior angle measures is 5x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. A pentagon has five sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 5 in. The measure of each interior angle of a regular pentagon is Find the measure of each interior angle of each regular polygon. 21. dodecagon Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 12 sides. Since all angles of a regular dodecagon are congruent, the sum of the interior angle measures is 12x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. 23. decagon Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 10 sides. Since all angles of a regular decagon are congruent, the sum of the interior angle measures is 10x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. The measure of each interior angle of a regular decagon is The measure of each interior angle of a regular dodecagon is esolutions Manual - Powered by Cognero Page 7

8 24. nonagon Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 9 sides. Since all angles of a regular nonagon are congruent, the sum of the interior angle measures is 9x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. 25. CCSS MODELING Hexagonal chess is played on a regular hexagonal board comprised of 92 small hexagons in three colors. The chess pieces are arranged so that a player can move any piece at the start of a game. a. What is the sum of the measures of the interior angles of the chess board? b. Does each interior angle have the same measure? If so, give the measure. Explain your reasoning. The measure of each interior angle of a regular nonagon is a. A hexagon has six sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 6 in. b. Yes, 120; sample answer: Since the hexagon is regular, the measures of the angles are equal. That means each angle is or 120. a. 720 b. Yes, 120; sample answer: Since the hexagon is regular, the measures of the angles are equal. That means each angle is or 120. esolutions Manual - Powered by Cognero Page 8

9 The measure of an interior angle of a regular polygon is given. Find the number of sides in the polygon Let n be the number of sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 60n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as Let n be the number of sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 120n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as Let n be the number of sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 90n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as Let n be the number of sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 156n. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as esolutions Manual - Powered by Cognero Page 9

10 Find the value of x in each diagram. 30. write an equation. Then solve for x. 32. write an equation. Then solve for x write an equation. Then solve for x. 33. write an equation. Then solve for x esolutions Manual - Powered by Cognero Page 10

11 Find the measure of each exterior angle of each regular polygon. 34. decagon A regular decagon has 10 congruent sides and 10 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 10n = 360 Solve for n. n = 36 The measure of each exterior angle of a regular decagon is pentagon A regular pentagon has 5 congruent sides and 5 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 5n = 360 Solve for n. n = 72 The measure of each exterior angle of a regular pentagon is hexagon A regular hexagon has 6 congruent sides and 6 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 6n = 360 Solve for n. n = 60 The measure of each exterior angle of a regular hexagon is gon A regular15-gon has 15 congruent sides and 15 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle and write and solve an equation. The measure of each exterior angle of a regular 15- gon is esolutions Manual - Powered by Cognero Page 11

12 38. COLOR GUARD During the halftime performance for a football game, the color guard is planning a new formation in which seven members stand around a central point and stretch their flag to the person immediately to their left as shown. a. What is the measure of each exterior angle of the formation? b. If the perimeter of the formation is 38.5 feet, how long is each flag? a. The given formation is in the shape of a regular heptagon. A regular heptagon has 7 congruent sides and 7 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 7n = 360 Solve for n. n 51.4 The measure of each exterior angle of the formation is about b. To find the perimeter of a polygon, add the lengths of its sides. This formation is in the shape of a regular heptagon. Let x be the length of each flag. The perimeter of the formation is 7x, that is, 38.5 feet. Find the measures of an exterior angle and an interior angle given the number of sides of each regular polygon. Round to the nearest tenth, if necessary The given regular polygon has 7 congruent sides and 7 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 7n = 360 Solve for n. n 51.4 The measure of each exterior angle of a 7-sided regular polygon is about Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 7 sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 7x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. The measure of each interior angle of a regular polygon with 7 sides is about , The length of each flag is 5.5 ft. a. about 51.4 b. 5.5 ft esolutions Manual - Powered by Cognero Page 12

13 The given regular polygon has 13 congruent sides and 13 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 13n = 360 Solve for n. n 27.7 The measure of each exterior angle of a 13-sided regular polygon is about Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 13 sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 13x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as The given regular polygon has 14 congruent sides and 14 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n be the measure of each exterior angle. write an equation. 14n = 360 Solve for n. n 25.7 The measure of each exterior angle of a 14-sided regular polygon is about Let n be the number of sides in the polygon and x be the measure of each interior angle of a regular polygon with 14 sides. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 14x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. The measure of each interior angle of a regular polygon with 13 sides is about , The measure of each interior angle of a regular polygon with 14 sides is about , esolutions Manual - Powered by Cognero Page 13

14 42. PROOF Write a paragraph proof to prove the Polygon Interior Angles Sum Theorem for octagons. The Polygon Interior Angles Sum Theorem states that the sum of the interior angle measures of an n- sided polygon is (n - 2)180. So for an octagon, we need to prove that the sum of the interior angle measures is (8-2)(180) or First, draw an octagon with all the diagonals from one vertex. Notice that the polygon is divided up in to 6 triangles. The sum of the measures of the interior angles of each triangle is 180, so the sum of the measures of the interior angles of the octagon is = 1080 = ( 8 2) 180 or (n 2) 180 if n = the number of sides of the polygon. Draw all the diagonals from one vertex in an octagon. Notice that the polygon is divided up in to 6 triangles. The sum of the measures of the interior angles of each triangle is 180, so the sum of the measures of the interior angles of the octagon is = 1080 = ( 8 2) 180 or (n 2) 180 if n = the number of sides of the polygon. 43. PROOF Use algebra to prove the Polygon Exterior Angle Sum Theorem. The Polygon Exterior Angles Sum Theorem states that the sum of the exterior angle measures of a convex polygon is 360. So, we need to prove that the sum of the exterior angle measures of an n-gon is 360. Begin by listing what we know. The sum of the interior angle measures is (n - 2)(180). Each interior angle forms a linear pair with its exterior angle. The sum of the measures of each linear pair is 180. We can find the sum of the exterior angles by subtracting the sum of the interior angles from the sum of the linear pairs. Consider the sum of the measures of the exterior angles N for an n-gon. N = sum of measures of linear pairs sum of measures of interior angles = 180n 180(n 2) = 180n 180n = 360 So, the sum of the exterior angle measures is 360 for any convex polygon. Consider the sum of the measures of the exterior angles N for an n-gon. N = sum of measures of linear pairs sum of measures of interior angles = 180n 180(n 2) = 180n 180n = 360 So, the sum of the exterior angle measures is 360 for any convex polygon. esolutions Manual - Powered by Cognero Page 14

15 44. CCSS MODELING The aperture on the camera lens shown is a regular 14-sided polygon. a. What is the measure of each interior angle of the polygon? b. What is the measure of each exterior angle of the polygon? a. Let x be the measure of each interior angle. Since all angles of a regular polygon are congruent, the sum of the interior angle measures is 14x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. ALGEBRA Find the measure of each interior angle. 45. decagon, in which the measures of the interior angles are x + 5, x +10, x + 20, x + 30, x + 35, x + 40, x + 60, x + 70, x + 80, and x + 90 A decagon has ten sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 10 in. Use the value of x to find the measure of each angle. the measures of the interior angles are 105, 110, 120, 130, 135, 140, 160, 170, 180, and , 110, 120, 130, 135, 140, 160, 170, 180, 190 The measure of each interior angle of a regular polygon with 14 sides is about b. The given regular polygon has 14 congruent sides and 14 congruent interior angles. The exterior angles are also congruent, since angles supplementary to congruent angles are congruent. Let n = the measure of each exterior angle and write and solve an equation. The measure of each exterior angle of a 14-sided regular polygon is about a. about b. about 25.7 esolutions Manual - Powered by Cognero Page 15

16 46. polygon ABCDE, in which the measures of the interior angles are 6x, 4x + 13, x + 9, 2x 8, 4x 1 A pentagon has five sides. Use the Polygon Interior Angles Sum Theorem to find the sum of its interior angle measures. Substitute n = 5 in. 47. THEATER The drama club would like to build a theater in the round so the audience can be seated on all sides of the stage for its next production. Use the value of x to find the measure of each angle. a. The stage is to be a regular octagon with a total perimeter of 60 feet. To what length should each board be cut to form the sides of the stage? b. At what angle should each board be cut so that they will fit together as shown? Explain your reasoning. a. Let x be the length of each side. The perimeter of the regular octagon is 8x, that is, 60 feet. The length of each side is 7.5 ft. b. First find the measure of each interior angle of a regular octagon. Since each interior angle is comprised of two boards, divide by 2 to find the angle of each board. The measure of each angle of a regular octagon is 135, so if each side of the board makes up half of the angle, each one measures or a. 7.5 ft b. 67.5; Sample answer: The measure of each angle of a regular octagon is 135, so if each side of the board makes up half of the angle, each one measures or MULTIPLE REPRESENTATIONS In this problem, you will explore angle and side relationships in special quadrilaterals. a. GEOMETRIC Draw two pairs of parallel lines esolutions Manual - Powered by Cognero Page 16

19 . Since polygon QRSTVX is regular, XQ = QR. By the Isosceles Theorem,.The interior angles of a triangle add up to 180, so. By substitution, a + a =180. So, 2a = 60 and a = 30. by angle addition. By substitution,. From subtraction,. So, b = 90. By SAS,. By angle addition,. By substitution,. So, and since by CPCTC,. In. By substitution, 90 + c + 30 = 180. So c = CCSS ARGUMENTS If two sides of a regular hexagon are extended to meet at a point in the exterior of the polygon, will the triangle formed sometimes, always or never be equilateral? Justify your answer. Draw a diagram first. In order to determine whether triangle PQR is equilateral, find the measures of the exterior angles of the hexagon. By the Exterior Angle Sum Theorem,. Since the sum of the interior angle measures is 180, the measure of. So, is always an equilateral triangle. Always; by the Exterior Angle Sum Theorem,. Since the sum of the interior angle measures is 180, the measure of. So, is an equilateral triangle. esolutions Manual - Powered by Cognero Page 19

20 52. OPEN ENDED Sketch a polygon and find the sum of its interior angles. How many sides does a polygon with twice this interior angles sum have? Justify your answer. Sample answer: Draw a regular pentagon and find the sum of the interior angle measures. Interior angles sum = (n - 2) 180 Interior angles sum = (5 2) 180 or 540. Twice this sum is 2(540) or To find a polygon with this interior angles sum, write the equation: (n 2) 180 = 1080 and solve for n; n = WRITING IN MATH Explain how triangles are related to the Interior Angles Sum Theorem. The Interior Angles Sum Theorem is derived by drawing all of the possible diagonals from one vertex of a polygon. This forms (n - 2) triangles in the interior of the polygon with n sides. Since the sum of the measures of a triangle is 180, the sum of the interior angle measures of a convex polygon is (n - 2) 180. The Interior Angles Sum Theorem is derived from the pattern between the number of sides in a polygon and the number of triangles. The formula is the product of the sum of the measures of the angles in a triangle, 180, and the number of triangles in the polygon. 8; Sample answer: Interior angles sum = (5 2) 180 or 540. Twice this sum is 2(540) or A polygon with this interior angles sum is the solution to (n 2) 180 = 1080, n = 8. esolutions Manual - Powered by Cognero Page 20

21 54. If the polygon shown is regular, what is? 55. SHORT RESPONSE Figure ABCDE is a regular pentagon with line passing through side AE. What is? A 140 B 144 C 162 D 180 Since the given regular polygon has 9 congruent sides, it is a regular nonagon. Let x be the measure of each interior angle of a regular polygon with 9 sides. Since all angles of a regular nonagon are congruent, the sum of the interior angle measures is 9x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. Let x be the measure of each interior angle of a regular polygon with 5 sides. Since all angles of a regular pentagon are congruent, the sum of the interior angle measures is 5x. By the Polygon Interior Angles Sum Theorem, the sum of the interior angle measures can also be expressed as. The measure of each interior angle of a regular nonagon is 140. So, the correct option is A. A The measure of each interior angle of a regular pentagon is 108. Here, angle y and angle E form a linear pair. 72 esolutions Manual - Powered by Cognero Page 21

22 56. ALGEBRA Compare the given measures. 58. F G H J 12 By converse of the Hinge Theorem,. 59. JM and ML The correct option is G. G 57. SAT/ACT The sum of the measures of the interior angles of a polygon is twice the sum of the measures of its exterior angles. What type of polygon is it? A square B pentagon C hexagon D octagon E nonagon The sum of the exterior angle measures of a convex polygon, one angle at each vertex, is 360. The sum of the interior angle measures of an n-sided convex polygon is. By the given information, Solve for n. By the Hinge Theorem, ML < JM. ML < JM 60. WX and ZY By the Hinge Theorem, WX < ZY. WX < ZY If a polygon has 6 sides, then it is a hexagon. The correct option is C. C esolutions Manual - Powered by Cognero Page 22

23 61. HISTORY The early Egyptians used to make triangles by using a rope with knots tied at equal intervals. Each vertex of the triangle had to occur at a knot. How many different triangles can be formed using the rope below? Use the Triangle Inequality theorem to determine how many different triangles can be made from the rope shown. the rope has 13 knots and 12 segments. One is a right triangle with sides of 3, 4, and 5 segments. 62. Show that the triangles are congruent by identifying all congruent corresponding parts. Then write a congruence statement. Sides and angles are identified as congruent if there are an equal number of tick marks through them. When two triangles share a common side, then those sides are considered congruent. One is an isosceles triangle with sides of 5, 5, and 2 segments. And an equilateral triangle can be formed with sides 4 segments long. So there are 3 different triangles formed from the rope. 3 esolutions Manual - Powered by Cognero Page 23

24 In the figure,. Name all pairs of angles for each type indicated. 63. From the figure shown, angles E and G are each right angles and each pair of opposite sides is parallel. is a transversal through. Since alternate interior angles are congruent,. By the Reflexive Property,. The distance between two parallel lines is the perpendicular distance between one line and any point on the other line. So,. 65. alternate interior angles Alternate interior angles are nonadjacent interior angles that lie on opposite sides of a transversal. 1 and 5, 4 and 6, 2 and 8, 3 and 7 1 and 5, 4 and 6, 2 and 8, 3 and consecutive interior angles Consecutive interior angles are interior angles that lie on the same side of a transversal. 64. Sides and angles are identified as congruent if there are an equal number of tick marks through them. When two triangles share a common side, then those sides are considered congruent. esolutions Manual - Powered by Cognero Page 24

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