Total degrees of a n-gon = (n-2)*180 degrees
Quadrilateral = 4 sides, so n = 4
(4-2)*180 degrees = 360 degrees.
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The 4 interior angles of a quadrilateral add up to 360 degrees
The 4 angles in a quadrilateral add up to 360 degrees.
They sides if a quadrilateral can add up to anything but the angles have to equal 360
All the interior angles add up to 360 degrees.
360