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Number of diagonals = 1/2*(n2-3n) where n = the number of sides of the polygon.
p^2+q^2=2(a^2+b^2) where p,q=diagonals of the parallelogram a,b=sides of the parallelogram
38 diagonals
The sides are equal The angle between adjacent sides is 90 degrees There are two diagonals The diagonals are equal in length The diagonals make 90 degrees with each other The diagonals make 45 degrees with the sides
1/2*(n2-3n) = number of diagonals where n is the number of sides of the polygon.