Find the number of sphere of radius `r` touching the coordinate axes.

The volume of a sphere of radius 2r is

The equation of the circle of radius 5 and touching the coordinates axes in third quadrant, is

Equation of a circle of radius 3 ,touching the coordinate axes,no portion of which lies below x -axis is

Equation of the circle of radius 5 which touches both the coordinate axes is

Find the equation of the circle which touches the coordinate axes and whose centre lies on the line x-2y=3

Find the differential equation of all the circles in the first quadrant which touch the coordinate axes.

Form the differential equation of the family of circles in the second quadrant and touching the coordinate axes.

Form the differential equation of the family of circles in the second quadrant and touching the coordinate axes.

Form the differential equation of the family of circles in the second quadrant and touching the coordinate axes.