Sum of Angles of a Quadrilateral

Author:
Terry Lee Lindenmuth
Topic:
Angles, Geometry, Quadrilaterals
Move the point A, B, C, D of the quadrilateral and observe the interior angles. Observe the congruent angles in the diagram below the quadrilateral.
What is the sum of the 4 interior angles of a quadrilateral? Answer the question using only a number.

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