If the area of circle increases at a uniform rate, then prove that the perimeter varies inversely as the radius.

If the area of a circle increases at a uniform rate, then prove that perimeter varies inversely as the radius.

(i) The radius of a circle is increasing at the rate of 5 cm/sec. Find the rate of increasing of its perimeter. (ii) If the area of a circle increases at a constant rate, then show that the rate of increase of its circumference is inversely proportional to its circumference is iversely proportional to its radius.

If the radius of a circle is increasing at a uniform rate of 2 cm/s, then find the rate of increase of area of circt the instant when the radius is 20 cm.

The area of a circle is the same as the area of a square. Their perimeters are in the ratio

The volume of a cube is increasing at a constant rate.Prove that the increase in surface area varies inversely as the length of the edge of the cube.

If the radius of a circle is increased by 8% ,then the area of the circle will be

If the radius of a circle be increasing at a uniform rate of 2cms^(-1) . The rate of increasing of area of circle, at the instant when the radius is 20 cm is