prove all angles of quadrilateral is360°
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divide the quadrilateral into 2 triangle and then by angle sum property each triangle is 180°
then 2 triangle is 180+180=360°
then 2 triangle is 180+180=360°
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Let PQRS is a quadrilateral
then join QS.
after this you can see in the picture..
I hope it may help you....
then join QS.
after this you can see in the picture..
I hope it may help you....
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