**Here is a link to practice problems from 2011 dealing with the angles of regular polygons.**

**Here are pictures of some mix and match tilings of the planes, which will be on the Tuesday homework.**

Here are more regular polygon problems.

The formula for total degrees of the angles on an

*n*-gon is 180(

*n*-2)° or [180

*n*-360]°.

The formula for the measure of a regular angle is [180-360/

*n*]°.

a) What is the sum of all the angles of a 20-gon?

b) What is the regular angle measure of a 20-gon?

c) What is the sum of all the angles of a 30-gon?

d) What is the regular angle measure of a 30-gon?

Answers to these questions in the comments.

## 1 comment:

a) What is the sum of all the angles of a 20-gon?

(20-2)*180 =

3240°.b) What is the regular angle measure of a 20-gon?

[180 - 360/20]° = [180 - 18]° =

162°c) What is the sum of all the angles of a 30-gon?

(30-2)*180 =

5040°.d) What is the regular angle measure of a 30-gon?

[180 - 360/30]° = [180 - 12]° =

168°Post a Comment