The sum of the 4 interior angles of any quadrilateral add up to 360 degrees.
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An interior angle is the inside angle of a shape e.g quadrilateral, square
360 degrees
The sum of the interior angles of a quadrilateral are 360 degrees
The 4 interior angles of a 4 sided quadrilateral add up to 360 degrees
An interior angle of a quadrilateral can have any value in the range (0, 360) degrees excluding 180 degrees. The only constraint is that the four interior angles sum to 360 degrees.