The sum of the interior angles is 360 Degrees or 2 Pi Radians.
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360 degrees
The sum of angles in a quadrilateral is 360 degrees.
In a quadrilateral the sum of all four angles equals 360º.
The 4 interior angles of a quadrilateral add up to 360 degrees
Opposite angles of a rhombus are equal and the sum of all four angles is that of any quadrilateral: 360o.