Area related to circle | Ex : 12.1

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 perimeter of a sheet of tin in the shape a quadrant of a circle is 12.5 cm. Find its area

The cicrcumference of a circle is give by the formula C = pid where d is the diameter of the circle. The formula for the area of a circle is A = pir^2 . If the area of the circle is 9pi , what is the circumference of the circle ?

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.

Volume & Surface area Ex : 13.1

The area of the circle centred at (1,2) and passing through (4,6) is

The area of the circle centred at (1,2) and passing through (4,6) is

The radius of a circle is stated as 2.12 cm. Its area should be written as

The figure above shows two circles , each with center O. Line segment bar(AB) is tangent to the smaller circle . If OA=5 and AB=12, what is the ratio of the area of the smaller circle to the area of the larger circle ?