If the diameter and area of a circle change ta the same rate, then the radius of this circle is

the side of a square is equal to the diameter of a circle. Ifthe side and radius change at the same rate then the ratio of the change of their areas is

The side of a square is equal to the diameter of a circle. If the side and radius change at the same rate, then the ratio of the change of their areas, is

The side of a square is equal to the diameter of a circle. If the side and radius change at the same rate, then the ratio of the change of their areas, is

If the area of a circle change at the rate of 0.8 cm^(2)//sec , then, when the radius is 4 cm , it circumference changes at the rate of

If the area of a circle changes at the rate of 2pi cm^(2)//sec , then, when the radius is 10cm, the radius is changing at the rate of

If the radius of a circle is increasing at the rate of 2 cm/ sec, then the area of the circle when its radius is 20 cm is increasing at the rate of

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

If the circumference of a circle changes at rate of 0.2 cm //sec , then , when the radius is 8 cm , its area is changing at the rate of