Question

Prove that by joining A(4,5) B(4,2) C(8,2) we get right Triangle​

Answer 1

Answer:

For what value of k the points are collinear?

We know that for collinear points, the area of the triangle formed by them is 0. Here x1 = 8, x2 = k,x3 = 2. y1 = 1,y2 = -4,y3 = -5. k = 3.