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Question

State whether the given statement is true or false. Justify your answer

The points A(3,1), B(12,-2) and C(0,2) cannot be vertices of a triangle.

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Solution

True
Let A=(x1,y1)=(3,1),B=(x2,y2)=(12,2)
and C=(x3,y3)=(0,2)
Area of ΔABC=12[x1(y2y3)+x2(y3y1)+x3(y1y2)]=12[3(22)+12(21)+0(1(2))]=13[3(4)+12(1)+0]=13(12+12)=0Area of ΔABC=0
Hence, the points A(3,1), B(12,-2) and C(0,2) are collinear. So, the points A(3,1), B(12,-2) and C(0,2) cannot be the vertices of a triangle.

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