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posted by michele on Friday, April 22, 2011 at 5:30pm.

A polygon has 20 diagonals .how many sites it have? ans 8 BUT HOW DO WE GET IT

http://www.mathsisfun.com/geometry/regular-polygons.html

Even i don't know but just memorize the formula n(n-3)/2 = No of diagonals. Where n is the number of sides

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