Asked by michele

A polygon has 20 diagonals .how many sites it have?

ans 8 BUT HOW DO WE GET IT


Answered by Ms. Sue
http://www.mathsisfun.com/geometry/regular-polygons.html

Answered by Hamza
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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