It has: 0.5*(100^2-(3*100)) = 4850 diagonals
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The name of a 100 sided polygon is Hectogon.
98
100*(100-3)/2 = 4850
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 100-sided polygon