Posted by Cassie on Tuesday, March 10, 2009 at 3:36pm.
add up the exterior angles between the extension of one side and the next side.
They must add up to 360 because they go all the way around.
Then the interior angle is the supplement.
For example for a regular pentagon
exterior between side extension and side = 360/5 = 72
so each interior angle is
180 - 72 = 108
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