There are: 0.5*(10002-3000) = 498,500 diagonals
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it's a 12 sided shape and it has 54 diagonals :D
12=)Improved Answer:-It has 14 because the formula of 0.5*(49-27) = 14 diagonals
Just calling it a "1000-sided shape" is fine. It is too much trouble to search for fancy name for figures with many sides.
A 3-sided polygon is a triangle. There is no diagonal for that shape since all non-adjacent vertices share a line segment!
There are 35 diagonals in a 10 sided decagon