For a polygon with n sides, there would be n*(n-3)/2
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There is no such polygon that has 95 diagonals because a 15 sided polygon has 90 diagonals and a 16 sided polygon has 104 diagonals.
It depends if the polygon is convex or concave but if it is a regular polygon it would have 560
A regular 100-sided polygon has 4,850 diagonals. You can either check this for yourself, or use the formula provided in Related Questions below.
A regular polygon.
That polygon is called a "triangle". It has no diagonals.