Prove that all the angle of quadriteteral are 360 degrees

1.	Prove that all the angle of quadriteteral are 360 degrees
Answer» If we draw one diagonal to quadrilateral we will get two triangles i.e.\xa0△ABC\xa0and\xa0△ACD\xa0and we know that sum of the angles of a triangle is\xa0180oSum of angles of quadrilateral ABCD=sum of angles of\xa0△ABC\xa0+ sum of the angles\xa0△ACD=\xa0180o+180o=\xa0360o

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