Require to find the area of the triangle: E(1,3),F(−4,−3),G(5,−4)
Let (x1,y1)=(1,3),(x2,y2)=(−4,−3),(x3,y3)=(5,−4)
Area of the triangle EFG =21[x1(y2−y3)+x2(y3−y1)+x3(y1−y2)]
=21[1(−3+4)−4(−4−3)+5(3+3)]
=21[1+28+30]=259 square units
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