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

If the circle S=0 touches X -axis then

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

Two circles touch each other externally. The distance between their centres is 7 cm. If the radius of one circle is 4 cm, then the radius of the other circle is

Four circles each with radius 2 touches the axes, then the radius of the largest circle touching all the four circles, is

(a,c) and (b,c) are the centres of two circles whose radical axis is the y-axis.If the radius of the first circle is r then the diameter of the other circle is

Circle K is inscribed in the first quadrant touching the circle radius of the circle K, is-