find the area of triangle by the points A(10, -6), B(2, 5) and C(-1, 3).
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by using the formula of area of triangle
A(10,-6)=(x1,y1)
B(2,5)=(x2,y2)
C(-1,3)=(x3,y3)
Area of triangle = 1/2 [x1(y2-y3)+x2(y3-y1)+x3(y1-y2)]
=1/2[10(5-3)+2(3-(-6))+(-1)(-6-5)]
=1/2[10(2)+2(3+6)-1(-11)]
=1/2[20+2(9)+11]
=1/2[20+18+11]
=1/2[49]
=49/2
=24.5
Area of triangle =24.5 units
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