If p(2,1) q(4,2) r(5,4) and s(3,3) are the vertices of a quadrilateral pqrs then find the area of the quadrilateral pqrs
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It can be solved by joining AD and finding the at. by this formula
1/2{1(y2-y3) +x2(y3-y1)+x3(y1-y2)} and the add the at. of the triangles
1/2{1(y2-y3) +x2(y3-y1)+x3(y1-y2)} and the add the at. of the triangles
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