WBJEE 2018 Math Solved Paper

Question : 23 of 75

Marks: +1, -0

Let P(at2,2at), Q(ar2,2ar) be three points on a parabola y2=4ax. If PQ is the focal chord and PK, QR areparallel where the co-ordinates of K is (2a, 0), then the value of r is