A=1, -1
B=-4, 6
C=-3, -5
What will be the area of a triangle ABC formed by the point
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Explanation: letA(1, -1)=(x1, y1), and B(-4, 6)=
(x2, y2)and C(-3, -5)=(x3, y3)
=1/2 |x1(y2-y3)+x2(y3-y1)+x3(y1-y2)|
=1/2 |1(6-(-5))+-4(-5-(-1)+-3(-1-6)|
=1/2 |1×11+-4×-4+-3×-7|
=1/2 |11+8+21|
=1/2 |40|
=1/2×40
=20 sq. unit
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