Find the interior angle of a regular polygon whose exterior angle is 120 degree
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exterior angle + interior angle =180°
120°+interior angle =180°
interior angle =60°
120°+interior angle =180°
interior angle =60°
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int angle+ext angle=180°
int angle -ext angle =120°
so, int angle 150 and ext angle 30
now total ext angle is 360 so number of side
360/20= 12
int angle -ext angle =120°
so, int angle 150 and ext angle 30
now total ext angle is 360 so number of side
360/20= 12
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