If radius of circle 35cm.Then find out the area of circle.

If radius of circle 7/2 cm then find perimeter of quadrant.

In two concentric circles, a chord of length 24 cm of larger circle becomes a tangent to the smaller circle whose radius is 5 cm. Find the radius of the larger circle.

If two concentric circles, a chord of length 40 cm of larger circle becomes a tangent to the smallor circle whose radius is 15 cm. Find the radius of the larger circle.

A point P is 25 cm from the centre O of the circle. The length of the tangent drawn from P to the circle is 24 cm. Find the radius of the circle.

The radius of a circle is equal to the sum of the circumfernces of two circles of diameters 36 cm and 20 cm is ……… cm .

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

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.

If the radius of a circle is 2.1 cm, then the approximate area of the circle is

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