There are 275 diagonals in a shape with 25 sides. The formula is n*(n-3)/2
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A 25-sided shape would have no parallel sides !
25-gon.
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The method of finding the sum of the interior angles of a polygon is by multiplying the (number of sides)-2 by 180, so the sum of the interior angle measures in a 25-sided polygon would be 23*180, or 4140 degrees.
Well, honey, a 25 sided polygon is called a "icosikaihenagon." Yes, it's a mouthful, just like your nosy neighbor's gossip. So next time you need to impress someone with your geometry knowledge, just drop that bombshell of a word and watch them squirm.