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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360.
a quadrilateral equal then the answer is 360 degrees .
They sides if a quadrilateral can add up to anything but the angles have to equal 360
360
The sum of all inside angles of a quadrilateral equal 360 degrees.