find the area of triangle whose vertices are (x1,y1),(x2,y2)and(x3,y3) os goven by

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find the area of triangle whose vertices are (x1,y1),(x2,y2)and(x3,y3) os goven by

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Answer:area = 1*2<x1(y2-y3)+x2(y3-y1)+x3(y1-y2)> is the answer.