The length of an arc of a sector of angle θ° of a circle with radius R is

In making 1000 revolutions, a wheel covers 88 km. The diameter of the wheel is

The area of a sector of angle θ° of a circle with radius R is

The length of the minute hand of a clock is 21 cm. The area swept by the minute hand in 10 minutes is

A chord of a circle of radius 10 cm subtends a right angle at the centre. The area of the minor segments (given, π = 3.14) is