Area of a circle: Area of a circle refers to the space enclosed by the circumference of the circle. For circles in maths, area can be calculated using radius or diameter (parts of circle).

Out of all the geometric shapes and figures, the circle is a fascinating form present around us. The pizza, coins, the sun are all circular in shape. Have you ever thought about how many sides a circle …

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Find the curved surface area of a cone whose circumference of the base is 66 cm and slant height is 12 cm. View Solution Q 4

A piece of wire is bent in the shape of an equilateral triangle of side 4.4 cm. If this wire is rebent to form of a circle, find the radius and the area of the circle.

Let the radius of original circle = r ∴ Area of original circle =πr2 But, the radius of the circle is decreased by 10%. ∴ Radius of new circle R= r− 10r 100= 9 10r Area of new circle = πR2 = π×(9 10r)2 = 81 …

In the given figure, ABCD is a square of side 5 cm inscribed in a circle. Find the area of the shaded region [Take π = 3.14] 16.75 cm2 14.25 cm2 25 cm2 15.25 cm2

Find the original radius of a circle given that when the area of the circle is increased by 44 cm, its radius increases by 2 cm.

The area of the smaller region bounded by the circle 2 +y2 = 1 and the lines = +1 is

A sector is cut from a circular sheet of radius 100 cm, the angle of the sector being 240∘. If another circle of the area same as the sector is formed, then radius of the new circle is 79.5cm 81.6cm 83.4cm …