(number of sides-2)*180 = total sum of interior angles
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To calculate that, we use the formula (n-2)180 where n=number of sides of polygon.
Use the formula (n-2)*180 = sum of interior angles whereas 'n' is the number of sides of the polygon
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There is no regular polygon with an interior angle of 20o. If the interior angle is 120o then there are six sides and the sum of the angles is 720o.