1.

Sum of interior angles of a quadrilateral is 360°​

Answer»

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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