PROVE that the summer of the angles of QUADRILATERAL is 360 DEGREE
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just joined the digonal so we get two triangles here now by using angle sum property in 1st triangle we get angles's sum=180° and similarly in 2nd triangle we get total sum =180°.
hence sum of all the four angles of a quadrilateral=180°+180°=360°
hence sum of all the four angles of a quadrilateral=180°+180°=360°
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