The equation of circle is x2+y2−2x=0. The point P(−1,0) lies
The radius of the circle S is same as the radius of x2 + y2 − 2x + 4y − 11 = 0 and the centre of S is the centre of x2 + y2 − 2x − 4y + 11 = 0 . Find the equation of S.
If a circle passes through the point (1, 2) and cuts the circle x2+y2=4 orthogonally, then the equation of the locus of its centre is