# Sum of the interior angles of a (n - 2)180 polygon ~, Sum of the exterior angles of a 360 polygon

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1 Name Geometry Polygons Sum of the interior angles of a (n - 2)180 polygon ~, Sum of the exterior angles of a 360 polygon Each interior angle of a regular (n - 2)180 i polygon n Each exterior angle of a regular 360 polygon n

2 Geometry WORKSHEET: Polygon Angle Measures NAME: PERIOD: DATE: Use the given information to complete the table. Round to the nearest tenth if necessary. 1) # Sides 2) 14 3) 24 4) 17 Interior Angle Sum 5) ) 900o 7) ) 1620 Measure of ONE INTERIOR Angle (Regular Polygon) 9) 150 lo) ) 156 Exterior Angle Sum Measure of ONE EXTERIOR Angle (Regular Polygon) 12) 10 13) ) 90 15) 0

3 Geometry NAME: WORKSHEET: Angles of Polygons - Review PERIOD: DATE: USING THE INTERIOR & EXTERIOR ANGLE SUM THEOREMS 1) The measure of one exterior angle of a regular polygon is given. Find the nmnbar of sides for each, a) 72 b) 40 2) Find the measure of an interior and an exterior angle of a regular 46-gon. 3) The measure of an exterior angle of a regular polygon is 2x, and the measure of an interior angle is 4x. a) Use the relationship between interior and exterior angles to find x. b) Find the measure of one interior and exterior angle. c) Find the number of sides in the polygon and the type of polygon. 4) The measure of one interior angle of a regular polygon is 144. How many sides does it have? 5) Five angles of a hexagon have measures 100, 110, 120, 130, and 140. What is the measure of the sixth angle?

4 6) Find the value ofx. a) b) 7) ABCDE and HIJKL are regular pentagons and AEFGHL is a regular hexagon. If Z.ABK -=/LKB, find m/_abk. B K J G 4

5 Geometry NAME: WORKSHEET: Polygons & lnterior Angles PERIOD: DATE: USING THE INTERIOR ANGLE SUM THEOREM Since a hexagon has six (6) sides, we can find the sum of all six interior angles by using n = 6 and: Sum = (n-2) 180 = (6-2).180 o = (4)-180 o Hexagon Sum = 720 All regular polygons are equiangular, therefore, we can find the measure of each interior angle by: One interior angle of a regular polygon - (n - 2). 180 ~ [ Sum of all angles For a hexagon: 720 One interior angle = Note: The previous information could also be used to find the number of sides for a regular polygon given the measure of one interior angle. Example: How many sides does a regular polygon have if one interior angle measures 157.5? From above: What is the value of n? 157,5- (n-2).180 OR 157.5n = (n-2) 180 PRACTICE... Show all work required to complete each of the following. 1) What is another name for a regular quadrilateral? 2) Find the sum of the measures of the interior angles of a convex heptagon. 3) What is the measure of each interior angle of a regular pentagon?

6 4) The sllnl of the interior angles of a polygon is How many sides does it have? 5) Can the interior angles of a polygon have a sum between 4300 and 4400? If so, how many sides can it have? 6) The measure of the interior angle of a regular polygon is 179. How many sides does it have? 7) Is it possible for a regular polygon to have each of its interior angles measure 142? Support your answer. 8) Find the value ofx in the figure given.

7 Geometry ~ = Polygons Concave pentagon Convex septagon 3. Concave octagon 4. Concave equilateral quadrilateral 5. Convex equiangular hexagon 6. Convex regular decagon

8 Classify each diagra~n: Concave Equiangular Hexagon ~onve Equilateral Octagon Pentagon Triangle Regular dodecagon decagon nonagon o 10o ,

9 Name the Polygon ~o different ways Remember - this doesn t mean classify!! 14. Matching: 16. lldodecagon triangle pentagon ~C nonagon D~6 20. ~quadri~ateral E lhexagon F octagon G. 9 23Ol,heptagon H decagon I. 12

10 25 Name all angles consecutive to ~ Name two diagonals. 26. & 27. Name two consecutive sides. 27.,9 & Explain why the given figure is not a polygon. Your answer must be in 29. Explain in complete sentences what it means if a polygon is regular. Sketch an example.

11 ,Geometry Name Date. Find the SUM of the interior angles of each polygon. a. odagon b. pentagon c. hexagon d. heptagon Find the SUM of the exterior angles of each polygon. a. octagon b. pentagon What is the measure of EACH interior angle of a regular: a. odagon b. pentagon c, hexagon d. decagon What is the measure of EACH exterior angle of a regular: a. octagon b. pentagon c. hexagon d. decagon

12 Find the measure of the variables.

13 the measure of the variables.

14 Find the measure of/-i in each figure, :/..3. ~ , Find the measure ef each angle, , (2x + 20) (x x F~nd bach unknown angle measure.

15 For questions 1-4, classify each polygon. Be as specific as possible. Z1. 0 Z2. "2, 5. Which of the polygons in 1-4 is concave? 2-6. Given:~ ~.~..~..." "-~.~. a) How many different ways can the polygon be named? b) Name a pair of consecutive sides. c) Name a pair of nonconsecutive vertices. 2.,7. True or Fafse? Every equilateral polygon is equiangular. ~-8. True or False? Every regular polygon is convex. "2..8. True or False? Every three sided polygon is convex Sketch a plane figure that is not a polygon and explain why it is not_.

16 ~ 1. Sketch the following: a) convex equilateral pentagon b) concave octagon c) regular quadrilateral Interior Exterior Sum (n-2) Each for Regular (n-2).180 n 360 n Find the sum of the interior angles of each convex polygon. a) nonagon b) 50-gon ~~the~me~a~su~re o~e~a c~n~e~o~ Find the measure of each exterior angle of a regular decagon. The measure of each exterior angle in a regular polygon is 24. How many sides does the polygon have? Two interior angles of a pentagon measure 80 and 100. The other three angles are congruent. Find the measure of each of the three angles.

17 Name Geometry Interior Angles Find the value for each variable.

18 /(2x-5o) o 150

19 k/ ~q

20

21 40) 2x+2 O) o Find the measure of each anc~le z-- m~a~d =,;~ZD~(2 = 4Z o mz CDB : mzhge -._ mlegb - 5z-10) o E (5Z +25) o F

22

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