1/2*(n2-3n) where n is the number of sides of the polygon.
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It is: 0.5*(n2-3n) = diagonals whereas 'n' is the number of sides of the polygon
You can find the number of diagonals in a polygon using the formula n(n-3)/2, where n is the number of sides. Therefore an 11 sided polygon has 44 diagonals.
Formula: 0.5*(n2-3n) and n is the number of sides 0.5*(462-138) = 989 diagonals
The formula used to find the number of diagonals in a polygon is n(n-3)/2. 30 x 27/2 = 810/2 = 405 diagonals.
Use the formula of: 0.5*(n2-3n) whereby n is the number of sides of the polygon