How many diagonals are in a regular decagon?

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How many diagonals are in a regular decagon?

a ten sided figure

2007-11-17 09:24:01 · 2 answers · asked by Amanda T 1 in Education & Reference ➔ Homework Help

2 answers

35

If n is the number of sides, then the number of diagonals is

n(n-3)/2

So with 10 sides, the number is 10*7/2 = 70/2 = 35

2007-11-17 09:29:37 · answer #1 · answered by jenh42002 7 · 0⤊ 0⤋

Yes, 35

Check this weblink out for a full explanation as to why this is true, and how to find the number of diagonals for any polygon...

Hope this helps!

2007-11-17 09:40:17 · answer #2 · answered by blueskies 7 · 0⤊ 0⤋