Question

Find the circumference of a circle whose radius is

(i) 28 cm.
(ii) 1.4 m.

Answer 1

(i) Here, r = 28 cm
∴ Circumference = 2π r
= $\left(2\times \frac{22}{7}\times 28\right)$cm
= 176 cm
Hence, the circumference of the given circle is 176 cm.

(ii) Here, r = 1.4 m
∴ Circumference = 2π r
= $\left(2\times \frac{22}{7}\times 1.4\right)$ m
= $\left(2\times 22\times 0.2\right)$ m = 8.8 m
Hence, the circumference of the given circle is 8.8 m.