Question -
Answer -
Given (a, b), (aтАЩ, bтАЩ)and (a тАУ aтАЩ, b тАУ b) are collinear
We have the conditionthat three points to be collinear, the area of the triangle formed by thesepoints will be zero. Now, we know that, vertices of a triangle are (x1,y1), (x2, y2) and (x3, y3),then the area of the triangle is given by,
тЗТ┬аa bтАЩ = aтАЩ b
Hence, the proof.