SOLUTION: how do you find the number of sides of a polygon if the interior angles measure 140 degrees

Question 403149: how do you find the number of sides of a polygon if the interior angles measure 140 degrees
Found 2 solutions by Alan3354, scott8148:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The exterior angles are 40� (180 - 140)
The sum of ext angles of ALL polygons = 360�
360/40 = 9 sides

Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
the EXTERIOR angles of a regular polygon sum to 360�

the interior and exterior angles are supplementary ___ x + 140� = 180� ___ x = 40�

360� / 40� = n
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