# Proof that the Quadrilateral Angle Sum is 360 Degrees

After discussing the **triangle angle sum proof**, we now discuss the quadrilateral angle sum proof. The proof of this theorem comes from the fact that we can divide a quadrilateral into two triangles by drawing a diagonal. Since each triangle angle sum is 180°, the sum of the interior angle of the quadrilateral is therefore 360°.

Watch the video above to know the details of its proof.

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