There are: 0.5*(1002-(3*100)) = 4850 diagonals
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There is no such shape. And unfortunately the word is too much like two terms to determine which of them you mean.If the polygon has n sides (n>3), then it has n*(n-3)/2 diagonals.
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.
100*(100-3)/2 = 4850
It has: 0.5*(100^2-(3*100)) = 4850 diagonals
It consists of 98 triangles and has 4850 diagonals