A. (0, 0)

B. (1, 0)

C. (0, 1)

D. (1, 1)

If the polars of points on the circle x^{2}+y^{2}= a^{2 }w.r.t the circle x^{2}+y^{2}= b^{2 } touch the circle x^{2}+y^{2}= c^{2}, then a, b, c are in

If the equation of the circle which cuts orthogonally the circle x^{2}+y^{2}-4x+2y-7=0 and having centre at (2, 3) is x^{2}+y^{2}+2ax+2by+c=0 then the ascending order of a, b, c is

The parametric equation of the circle x^{2}+y^{2}+x+√3y=0 is

How many circles can be drawn each touching all the three lines x+y=1, x+1=y, 7x-y=6

Equation of the circle passing through A(1, 2), B(5, 2) so that the angle substended by AB at points on the circle is π/4 is