Let P(at2,2at),Q,R(ar2,2ar) be three points on a parabola y2=4ax. If P – InterviewSolution

1.	Let P(at2,2at),Q,R(ar2,2ar) be three points on a parabola y2=4ax. If PQ is the focal chord and PK,QR are parallel where the co-ordinates of K is (2a,0), then the value of r is
Answer» Let $P (a t^{2}, 2 a t), Q, R (a r^{2}, 2 a r)$ be three points on a parabola $y^{2} = 4 a x .$ If $P Q$ is the focal chord and $P K, Q R$ are parallel where the co-ordinates of $K$ is $(2 a, 0),$ then the value of $r$ is

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