1/2*(602-180) = 1710 diagonals
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1/2*(142-42) = 77 diagonals
There is none. A 5 sided shape is a pentagon but that has 10 diagonals, not 2.
It works out that a polygon with 1175 diagonals has 50 sides
You are a square
88*(88 - 3)/2 = 44*85 = 3740