The area of a circle is halved when its radius is decreased by 'n', then radius of circle is

Find the area of the circle if its radius is 2.1 m.

The area of a circle is increased by 22 cm' when its radius is increased by 1 cm. The original radius of the circle is

The radius of a circle is 7 cm. Find its area

The radius of a circle is 7 cm. Find its area

How fast the area of a circle increases when its radius is 5cm. (i) respect to radius (ii) with respect to diameter.

How fast the area of a circle increases when its radius is 5cm. (i) respect to radius (ii) with respect to diameter.

If the rate of change in the area of a circle is pi sq.cm/sec, then the rate of change in the radius of the circle when the radius is 10 cm is

The area of a circle is increased by 22 cm^2 its radius is increased by 1 cm. The original radius of the circle is