The Polygon Angle-Sum Theorems - Lemon Bay High
[Pages:2]Name
Class
6-1 Practice The Polygon Angle-Sum Theorems
Date
Form K
Find the sum of the angle measures of each polygon.
1.
To start, determine the sum of the angles using
the Polygon Angle-Sum Theorem.
Sum (n 2)180
= ( ? 2)180 =
2. 21-gon 4. 50-gon
3. 42-gon 5. 205-gon
Find the measure of one angle in each regular polygon.
6.
To start, write the formula used to calculate the
measure of an angle of a regular polygon. Then
substitute n = 9 into the formula.
(n 2)180 ( 2)180 n
.
8.
Find the missing angle measures.
9. To start, determine the sum of the angles using the Polygon Angle-Sum Theorem. Sum (n 2)180 (6 2)180 = 720 Write an equation relating each interior angle to the sum of the angles. n + 156 + 122 + 143 + 108 + 110 = 720
10.
11.
Prentice Hall Foundations Geometry ? Teaching Resources
Copyright ? by Pearson Education, Inc., or its affiliates. All Rights Reserved.
5
Name
Class
Date
6-1 Practice (continued) The Polygon Angle-Sum Theorems
Form K
Find the measure of an exterior angle of each regular polygon.
12. 12-gon
13. 24-gon
14. 45-gon
The sum of the angle measures of a polygon with n sides is given. Find n.
15. 900
16. 1440
17. 2340
18. Carly built a Ferris wheel using her construction toys. The frame of the wheel is a regular 16-gon. Find the sum of the angle measures of the Ferris wheel and the measure of one angle.
Algebra Find the value of each variable.
19.
20.
21. Your friend wants to build the picture frame shown at the right.
a. What regular polygon is the inside of the frame?
b. Find the measure of each numbered angle. c. Reasoning If you extended one of the exterior sides of the outside of the
frame, would the measure of the exterior angle be the same as the measure of 2? Explain.
22. Caning chair seats first became popular in England in the 1600s. This method of weaving natural materials produces a pattern that contains several polygons. Identify the outlined polygon. Then, assuming that the polygon is regular, find the measure of each numbered angle.
23. Algebra The measure of an interior angle of a regular polygon is four times the measure of an exterior angle of the same polygon. What is the name of the polygon?
24. Reasoning The measure of the exterior angle of a regular polygon is 30. What is the measure of an interior angle of the same polygon? Explain.
Prentice Hall Foundations Geometry ? Teaching Resources
Copyright ? by Pearson Education, Inc., or its affiliates. All Rights Reserved.
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