Find the rate of change of the area of a circle with respect to its radius r when
(a) r = 3 cm.

Find the rate of change of the area of circle with respect to its radius r when : (a) r = 3 cm (b) r = 4 cm.

Find the rate of change of the area of a circle with respect to its radius r when(a) r = 3 c m (b) r = 4 c m

Find the rate of change of the area of a circle with respect to its radius r when : r = 3 cm

Find the rate of change of the area of a circle with respect to its radius r when (b) r = 4cm.

Find the rate of change of the area of a circle with respect to its radius r when (a) r=3cm (b) r=4cm

Find the rate of change of the area of a circle with respect to its radius r when r = 3 cm.

Find the rate of change of the area of a circle with respect to its radius r when : r = 8 cm

Find the rate of change of the area of a circle with respect to its radius r when r = 5 cm.