show the sum of the of a
quadrilateral is 360०
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If we draw one diagonal to quadrilateral we will get two triangles i.e.∆ABC and ∆ACD and we know that sum of the angles of a triangle is 180°
Sum of angles of quadrilateral ABCD=sum of angles of ∆ABC + sum of the angles ∆ACD
= 180°+180°
= 360°
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