What is the measure of one angle of a regular convex 20-gon?
A triangle has an internal angle of 180/3 A square has an
internal angle of 360/4 A pentagon has an internal angle of 540/5
An 'x'-agon has an internal angle (180(x-2))/x = (180x-360)/x = 180
- 360/x A 20-agon has an internal angle of 180 - 360/20 = 162