20) Find the area of a triangle formed by the points (2,-3) , (4,2), and ( -6, 1) .
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area= 1/2[x1(y2-y3) +x2(y3-y1) +x3(y1-y2)]
=1/2[2(2-1) +4(1+3) +(-6) (-3-2) ]
=1/2[2(1) +4(4) -6(-5) ]
=1/2[2+16+30]
=1/2[48]
=24
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