Answer :


Sum of all the angles of a quadrilateral is 360°.

Because ,the quadrilateral can be divided into 2 triangles and sum of angles of each of the triangles is 180°.

when we join these 2 triangles to get back the original quadrilateral then the sum of all the angles of the quadrilateral is sum of angles of both the triangles ie. 180°(sum of angles of triangle1) + 180° (sum of angles of triangle2) = 360° (sum of angles of quadrilateral)

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