If the area of a circle increases uniformly, then show that the rate of increment of its circumference is inversely proportional to its radius.

If the area of circle changes uniformly w.r.t. time , show that the rate of change of its circumference varies iversely as its radius.

The radius of a circle is increasing at the rate of 0.7 cm/s. What is the rate of increase of its circumference?

If the radius of a circle be increased by 3 times, then how many times its circumference will be increased ?

If the radius of a circle be increased by 75%, then the change of its perimeter is

Prove that the rate of diffusion of a gas is inversely proportional to the square root of its density.

The mean free path of molecules of a gas (radius r) is inversely proportional to

If the radius of a circle increases by 50% find the percentage increases in the area of the circle.

The radius of a circle increases at the rate of (1)/(pi) . Find the rate of change of its (i) circumference and (ii) area when its radius is 2 units.

The radius of a circle is increasing uniformly at the rate of 3 cm/s. Find the rate at which the area of the circle is increasing when the radius is 10 cm.