find the area of the Triangles the coordinates of whose angular points are respectively
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the required area therefore,
=1/2[x1(y2-y3) +x2(y3-y1) +x3(y1-y2) ]
after that we put the value of it and find the value:
=1/2[1{6-(-1)} +(-7){(-1) -3}+5(3-6) ]
=1/2[7+28-15]
=1/2[35-15]
=1/2[20]
=10 .answer
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