: Find the area of the sector of a circle with radius 4 cm and of angle 30°.

A pendulum swings through on angle of 30∘ and describes an arc 8.8 cm in length. Find the length of pendulum in cm.

Radius of the outer circle is 18 cm and the radius of the inner circle is 7 cm. What is the area of the region between the outer and the inner circles?

There is a circle of diameter 10 cm. A chord of length 6 cm is drawn inside the circle. What is the distance between the centre and this chord in cm?

The area of the circle that can be inscribed in a square of side 6 cm

4.19

16.8

275 π

4

9π