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It can be proven that the sum of the interior angles of a polygon with n sides (or angles) is 180*(n-2) degrees.

Since a quadrilateral is a 4-sided polygon, n = 4, and so the sum of the angles is (4-2)*180 = 2*180 = 360 degrees.

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12y ago
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Q: Why does a quadrilateral equal to 360?
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