In a polygon with n sides, we have n(n-3)/2 diagonals. In a convex polygon with n sides, you can draw n-3 diagonals from each vertex, but you are counting each one twice you so you need to divide by do. That is why we have n(n-3) divided by 2
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38 diagonals
There are 275 diagonals in a 25 sided polygon
100 sided polygon has = n(n-3)/2 diagonals = 100(100-3)/2 = 4850 diagonals
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.
A polygon that has 104 diagonals will have 16 sides