Area related to circle | Class 10

The adjoining figure shows two circles with the same centre. The radius of the larger circle is 10 cm and the radius of the smaller circle is 4 cm.Find: (a) the area of the larger circle (b) the area of the smaller circle (c) the shaded area between two circles ( π=3.14)

The diameter of a circle whose area is equal to the sum of the areas of the two circles of radii 24 cm and 7 cm is

Find the area enclosed by the circle of radius a.

Three concentric circles have radii x cm, 10 cm and 5 cm such that x > 10 > 5. If the area enclosed by circles with radii x cm and 10 cm is the same as the area enclosed by the circles with radii 10 cm and 5 cm, find the area of the largest circle.

The radius of a circle is measured to be (10.8+-0.3)m . Calcualte the area of the circle.

Radius of a circle is increasing at rate of 3 cm//sec Find the rate at which the area of circle is increasing at the instant when radius is 10 cm.

If the sum of the areas of two circles with radii R_(1) and R_(2) is equal to the area of a circle of radius R, then

What is the area of the circle whose radius is the average of the radii of two circles with areas of 16pi and 100pi ?

A square of the largest area is cut out of a circle. What % of the area of the circle is lost as trimmings ?