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# Is there any general formula for finding the no. of diagonal

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Manager
Joined: 07 Jun 2006
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Is there any general formula for finding the no. of diagonal [#permalink]  18 Oct 2006, 19:27
Is there any general formula for finding the no. of diagonal of polygons.

eg; 4 sided polygon will have 2; 5 sided will have 5; how much will a 9 sided polygon have?
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Joined: 08 Jun 2006
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Location: Washington DC
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For n sided polygon n(n-3)/2
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