you subtract 3 from the number of sides then multiply that by the number of sides divided by 2
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A 7 sided polygon has 14 diagonals
The equation is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon
Well, honey, that would be rectangles. Those four-sided figures have diagonals that are equal in length and intersect at right angles outside the shape. So, if you're looking for a shape with some perpendicular diagonal action, rectangles are where it's at.
Find the midpoint of the two diagonals
11