Question

If PQ be a chord of the ellipse x^2/a^2+y^2/b^2=1 , which subtends right angle at the centre then is distance from the centre is equal to (A) (ab)/sqrt(a^2+b^2) (B) sqrt(a^2+b^2) (C) sqrt(ab) (D) depends on slope of chord​

Answer 1

the other plan that Halku tried