 Polygon Diagonals
 The number of diagonals in a polygon = n(n3)/2, where
n is the number of polygon sides.
 For a convex nsided polygon, there are n vertices, and
from each vertex you can draw n3 diagonals, so the total
number of diagonals that can be drawn is n(n3). However,
this would mean that each diagonal would be drawn twice,
(to and from each vertex), so the expression must be
divided by 2.
 For more discussion, see the Dr. Math archives:
 Counting Diagonals
 How many diagonals can be drawn for a polygon with n sides?
 Diagonals of Polygons
 How many diagonals does a polygon with n sides have?
