A circle with centre `(h,k)` .If the circle touches `x` -axis then the radius of the circle is

A circle centre (1,2) touches y-axis. Radius of the circle is

A is the centre of circle whose radius is 8 and B is the centre of a circle whose diameter is 8. If these two circles touch externally, then the area of the circle with diameter AB is

A circle with centre (h,k) .If the circle passing through (0,0) and centre lies on x -axis.Then the equation of the circle is

A circle has its centre on the y-axis and passes through the origin, touches anotgher circle with centre (2,2) and radius 2, then the radius of the circle is

The locus of centre of the circle touching x-axis nad the line y=x is

The locus of centre of the circle touching x-axis nad the line y=x is

A circle C_1 , of radius 2 touches both x -axis and y - axis. Another circle C_2 whose radius is greater than 2 touches circle and both the axes. Then the radius of circle is

A circle touches the x - axis and also touches the circle with centre (0,3) and radius 2. The locus of the centre of the circle is :