Posted by Monica on Monday, November 22, 2010 at 11:41am.
Look at a pair of interior and exterior angles.
Don't they form a straight line, so
13x-33 + x+3 = 180
14x = 210
x = 15
each exterior angle is 18°
and each interior is 162°
the sum of all exterior angles is always 360
so each angle is 360/18 or 20 angles
20 angles ----> 20 sides
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