Interior Angles of Regular Polygons

Author:
Lew W. S.
The polygons generated here are regular polygons, ie. polygons of sides of equal length and have interior angles that are all equal. Start with n = 5. How many triangles can be formed from the 5 sided regular polygon (pentagon) Continue with n =6, and 7, and so on until 20, by moving the slider for n below in the diagram