A rectangular hyperbola whose centre is C is cut by any circle of radius in four points P,Q,R and S. Then CP2+CQ2+CR2+CS2=
A rectangular hyperbola whose centre is C, is cut by any circle of radius r in four points P, Q, R and S. Then, CP2+CQ2+CR2+CS2 is equal to
A rectangular hyperbola whose center is C is cut by any circle of radius r in four points P,Q,R and S. Then if,
CP2+CQ2+CR2+CS2=kr2, find the value of k.