The measure of one interior angle of a regular polygon with 20 sides is 162°.
The general rule to find the measure of the interior angle of a polygon with n sides is:
( n - 2 ) * 180° / n
In the case of our 20-gon, n equals 20, so...
( 20 - 2 ) * 180° / 20
18 * 180° / 20
3240° / 20
162°
180
A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.
45 degree
Each interior angle measures 144 degrees
Each interior angle of a regular 5 sided pentagon measures 108 degrees
135
140
144
150
36
180
10000000000000
6
72 degrees
60
The measure of one angle of a regular pentagon is 108 degrees.
Exterior angle: 45 degrees Interior angle: 135 degrees