Because it complies with the formula: (n-2)*180 = sum of interior angles
A quadrilateral has 4 sides and so: (4-2)*180 = 360 degrees
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The angles of a quadrilateral add to 360 degrees.
The sum of the interior angles of a quadrilateral are 360 degrees
360 degrees
The sum of angles in a quadrilateral is 360 degrees.
The sum of the 4 interior angles of any quadrilateral add up to 360 degrees.