Verify sum of interior angle of a quadrilateral is 360° by using activity method.
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We have learned that the sum of internal angles of a quadrilateral is 360°, that is, ∠ABC + ∠BCD + ∠CDA + ∠DAB = 360°. let's prove that the sum of all the four angles of a quadrilateral is 360 degrees. We know that the sum of angles in a triangle is 180°.
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