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How many diagonals?

How many diagonals are there in a polygon with n sides?

2007-04-30 14:36:40 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

2 answers

n(n-3) / 2

2007-04-30 14:43:54 · answer #1 · answered by Renaissance Man 5 · 0⤊ 0⤋

There are C(n,2)-n sides= n(n-1)/2 -n=
=(n^2-3n)/2

2007-04-30 21:48:49 · answer #2 · answered by santmann2002 7 · 0⤊ 0⤋

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