How to find sum of interior angles of a polygon


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Explain how the formula for finding the sum of the interior angle measures of a polygon is derived. (Site 1)

Answered by admin @



The formula for finding the sum of the interior angles of a polygon is the same, whether the polygon is regular or irregular. So you would use the formula (n-2) x 180, where n is the number of sides in thepolygon. If you draw a diagonal in the square, that forms two triangles.

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