# Find the sum of the measures of the interior angles of a polygon. Find the sum of the measures of the exterior angles of a polygon.

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1 ngles of Polygons Find the sum of the measures of the interior angles of a polygon. Find the sum of the measures of the exterior angles of a polygon. Vocabulary diagonal does a scallop shell illustrate the angles of polygons? This scallop shell resembles a 12-sided polygon with diagonals drawn from one of the vertices. diagonal of a polygon is a segment that connects any two nonconsecutive vertices. For example, is one of the diagonals of this polygon. SUM OF MESURES OF INTERIOR NGLES Polygons with more than three sides have diagonals. The polygons below show all of the possible diagonals drawn from one vertex. Study Tip Look ack To review the sum of the measures of the angles of a triangle, see Lesson 4-2. quadrilateral pentagon hexagon heptagon octagon In each case, the polygon is separated into triangles. Each angle of the polygon is made up of one or more angles of triangles. The sum of the measures of the angles of each polygon can be found by adding the measures of the angles of the triangles. Since the sum of the measures of the angles in a triangle is 180, we can easily find this sum. Make a table to find the sum of the angle measures for several convex polygons. onvex Number of Number of Sum of ngle Polygon Sides Triangle Measures triangle 3 1 (1 180) or 180 quadrilateral 4 2 (2 180) or 360 pentagon 5 3 (3 180) or 540 hexagon 6 4 (4 180) or 720 heptagon 7 5 (5 180) or 900 octagon 8 6 (6 180) or 1080 Look for a pattern in the sum of the angle measures. In each case, the sum of the angle measures is 2 less than the number of sides in the polygon times 180. So in an n-gon, the sum of the angle measures will be (n 2)180 or 180(n 2). Theorem 8.1 Interior ngle Sum Theorem If a convex polygon has n sides and S is the sum of the measures of its interior angles, then S 180(n 2). Example: n 5 S 180(n 2) 180(5 2) or hapter 8 Quadrilaterals Glencoe photo

2 Example 1 Interior ngles of Regular Polygons EMISTRY The benzene molecule, 6 6, consists of six carbon atoms in a regular hexagonal pattern with a hydrogen atom attached to each carbon atom. Find the sum of the measures of the interior angles of the hexagon. Since the molecule is a convex polygon, we can use the Interior ngle Sum Theorem. S 180(n 2) 180(6 2) n 6 180(4) or 720 Interior ngle Sum Theorem Simplify. The sum of the measures of the interior angles is 720. The Interior ngle Sum Theorem can also be used to find the number of sides in a regular polygon if you are given the measure of one interior angle. Example 2 Sides of a Polygon The measure of an interior angle of a regular polygon is 108. Find the number of sides in the polygon. Use the Interior ngle Sum Theorem to write an equation to solve for n, the number of sides. S 180(n 2) (108)n 180(n 2) 108n 180n 360 Interior ngle Sum Theorem S 108n Distributive Property 0 72n 360 Subtract 108n from each side n dd 360 to each side. 5 n Divide each side by 72. The polygon has 5 sides. In Example 2, the Interior ngle Sum Theorem was applied to a regular polygon. In Example 3, we will apply this theorem to a quadrilateral that is not a regular polygon. Example 3 LGER Interior ngles Find the measure of each interior angle. Since n 4, the sum of the measures of the interior angles is 180(4 2) or 360. Write an equation to express the sum of the measures of the interior angles of the polygon. 360 m m m m D Sum of measures of angles 360 x 2x 2x x Substitution 360 6x ombine like terms. 60 x Divide each side by 6. Use the value of x to find the measure of each angle. 2 m 60, m 2 60 or 120, m 2 60 or 120, and m D D Lesson 8-1 ngles of Polygons 405

3 SUM OF MESURES OF EXTERIOR NGLES The Interior ngle Sum Theorem relates the interior angles of a convex polygon to the number of sides. Is there a relationship among the exterior angles of a convex polygon? Study Tip Look ack To review exterior angles, see Lesson 4-2. Sum of the Exterior ngles of a Polygon ollect Data Draw a triangle, a convex quadrilateral, a convex pentagon, a convex hexagon, and a convex heptagon. Extend the sides of each polygon to form exactly one exterior angle at each vertex. Use a protractor to measure each exterior angle of each polygon and record it on your drawing. nalyze the Data 1. opy and complete the table. 72 Polygon triangle quadrilateral pentagon hexagon heptagon number of exterior angles sum of measure of exterior angles 2. What conjecture can you make? The Geometry ctivity suggests Theorem 8.2. Theorem 8.2 Exterior ngle Sum Theorem If a polygon is convex, then the sum of the measures of the exterior angles, one at each vertex, is 360. Example: m 1 m 2 m 3 m 4 m Example 4 Exterior ngles Find the measures of an exterior angle and an interior angle of convex regular octagon DEFG. t each vertex, extend a side to form one exterior angle. The sum of the measures of the exterior angles is 360. convex regular octagon has 8 congruent exterior angles. 8n 360 n = measure of each exterior angle n 45 Divide each side by 8. You will prove Theorem 8.2 in Exercise 42. The measure of each exterior angle is 45. Since each exterior angle and its corresponding interior angle form a linear pair, the measure of the interior angle is or 135. G F D E 406 hapter 8 Quadrilaterals

4 oncept heck Guided Practice 1. Explain why the Interior ngle Sum Theorem and the Exterior ngle Sum Theorem only apply to convex polygons. 2. Determine whether the Interior ngle Sum Theorem and the Exterior ngle Sum Theorem apply to polygons that are not regular. Explain. 3. OPEN ENDED Draw a regular convex polygon and a convex polygon that is not regular with the same number of sides. Find the sum of the interior angles for each. Find the sum of the measures of the interior angles of each convex polygon. 4. pentagon 5. dodecagon The measure of an interior angle of a regular polygon is given. Find the number of sides in each polygon LGER Find the measure of each interior angle. 8. U V 9. (3x 4) J 2 T (3x 4) W K P L (9x 30) (9x 30) (9x 30) (9x 30) N 2 M pplication Find the measures of an exterior angle and an interior angle given the number of sides of each regular polygon QURIUMS The regular polygon at the right is the base of a fish tank. Find the sum of the measures of the interior angles of the pentagon. Practice and pply For Exercises See Examples Extra Practice See page 769. Find the sum of the measures of the interior angles of each convex polygon gon gon gon gon 17. 4y-gon 18. 2x-gon 19. GRDENING arlotta is designing a garden for her backyard. She wants a flower bed shaped like a regular octagon. Find the sum of the measures of the interior angles of the octagon. 20. GZEOS company is building regular hexagonal gazebos. Find the sum of the measures of the interior angles of the hexagon. The measure of an interior angle of a regular polygon is given. Find the number of sides in each polygon Lesson 8-1 ngles of Polygons 407

5 LGER Find the measure of each interior angle using the given information. 27. M P 28. F G 4 (x 20) (x 5) E (x 5) 5 2 (x 10) R Q 29. parallelogram MNPQ with 30. isosceles trapezoid TWYZ m M 10x and m N 20x with Z Y, m Z 30x, T W, and m T 20x J M N T W Q P Z Y 31. 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 polygon DE with m 6x, m 4x 13, m x 9, m D 2x 8, and m E 4x quadrilateral in which the measures of the angles are consecutive multiples of x 34. quadrilateral in which the measure of each consecutive angle increases by 10 Find the measures of each exterior angle and each interior angle for each regular polygon. 35. decagon 36. hexagon 37. nonagon 38. octagon Find the measures of an interior angle and an exterior angle given the number of sides of each regular polygon. Round to the nearest tenth if necessary PROOF Use algebra to prove the Exterior ngle Sum Theorem. 43. RITETURE The Pentagon building in Washington, D.., was designed to resemble a regular pentagon. Find the measure of an interior angle and an exterior angle of the courtyard. rchitecture Thomas Jefferson s home, Monticello, features a dome on an octagonal base. The architectural elements on either side of the dome were based on a regular octagon. Source: RITETURE ompare the dome to the architectural elements on each side of the dome. re the interior and exterior angles the same? Find the measures of the interior and exterior angles. 408 hapter 8 Quadrilaterals (l)monticello/thomas Jefferson Foundation, Inc., (r)spaceimaging.com/getty Images 45. RITIL TINKING Two formulas can be used to find the measure of an 180(n 2) interior angle of a regular polygon: s and s Show that n n these are equivalent.

6 Standardized Test Practice 46. WRITING IN MT nswer the question that was posed at the beginning of the lesson. ow does a scallop shell illustrate the angles of polygons? Include the following in your answer: explain how triangles are related to the Interior ngle Sum Theorem, and describe how to find the measure of an exterior angle of a polygon. 47. regular pentagon and a square share a mutual vertex X. The sides X Y and X Z are sides of a third regular polygon with a vertex at X. ow many sides does this polygon have? D GRID IN If 6x 3y 48 and 9 y 9, then x? 2x Z Y X Maintain Your Skills Mixed Review In, given the lengths of the sides, find the measure of the given angle to the nearest tenth. (Lesson 7-7) 49. a 6, b 9, c 11; m 50. a 15.5, b 23.6, c 25.1; m 51. a 47, b 53, c 56; m 52. a 12, b 14, c 16; m Solve each FG described below. Round angle measures to the nearest degree and side measures to the nearest tenth. (Lesson 7-6) 53. f 15, g 17, m F m F 47, m 78, g m G 56, m 67, g g 30.7, h 32.4, m G PROOF Write a two-column proof. (Lesson 4-5) Given: J L K M J K L M J Prove: JKL MLK K L M State the transversal that forms each pair of angles. Then identify the special name for the angle pair. (Lesson 3-1) and and and and m n b c Getting Ready for the Next Lesson PREREQUISITE SKILL In the figure, D and D. Name all pairs of angles for each type indicated. (To review angles formed by parallel lines and a transversal, see Lesson 3-1.) 62. consecutive interior angles alternate interior angles 64. corresponding angles D 65. alternate exterior angles 5 Lesson 8-1 ngles of Polygons 409

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