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OpenStudy (anonymous):
Sides are added to a convex polygon so that the sum of its interior angle measures is increased by 540 degrees. How many sides are added to the polygon?
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Directrix (directrix):
3 sides. For each 180 degrees, the number of sides goes up by one. This is a spin-off of the formula for the sum of the interior angles of a convex polygon. 180(n-2).
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