810. Find the weea of a triangle whose vertices are 38)(-2,1), (7-1). – InterviewSolution

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810. Find the weea of a triangle whose vertices are 38)(-2,1), (7-1).

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(3, 8), (-2, 1), (7, -1), formula 1/2[x1(y2-y3)+x2(y3-y1)+x3(y1-y2)]; 1/2{3(1-(-1)-2(-1-8)+7(8-1)}= 1/2{6+18+49}=1/2(73)=36.5 = Area triangle

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