Prove that the sum of the angles of a quadrilateral is 360°.
Hint-join A & C and use the angle sum property of triangles for ∆ABC & ∆ADC.
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By joining A & C we will get two triangles ∆ABC & ∆ADC
As we know that aum of all the angles of a triangle is 180°
so, there are two triangle s
=180°+180°
=360°
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