Question: tangents are drawn from the point (h k) to the circle?
Answer: The tangents are drawn from a point (h,k) to the circle x2+y2=a2 , proov that the area of triangle formed by them and the straight line joining their points of contact is [ a(h2+k2-a2)3/2 ] / h2+k2 . Not fully solved . It is just like hint.