Question

The circumference of a circle is 44 cm. Find its area. (Use pi = 22/7.)

Solution

1. Circumference = 2 x pi x r, so 44 = 2 x (22/7) x r.
2. This gives r = 44 x 7 / 44 = 7 cm.
3. Area = pi x r^2 = (22/7) x 7 x 7 = 154 cm^2.