A. 10

B. 12

C. 22

D. 40

If the points (2, 3), (0, 2), (4, 5) and (0, t) are concyclic, then t=

For the circle x^{2}+y^{2}-4x-2y-36=0, the point (3, 5)

The polars of two points A(1, 3) and B(2, -1) w.r.to the circle x^{2}+y^{2}=9 intersect at C. Then the polar of C w.r.to the circle is

The equation of the chord of the circle x^{2}+y^{2}-4x+6y-3=0 having (1, -2) as its midpoint is

From the point A(0,3) on the circle x^{2}+4x+(y-3)^{2}=0, a chord, AB is drawn and extended to a point P, such that AP = 2AB. The locus of P is