Question

Find the circumference of a circle whose diameter is

(i) 35 cm.
(ii) 4.9 m.

Answer 1

(i) Here, d = 35 cm
Circumference = 2π r
= $\left(\mathrm{\pi }d\right)$ [since 2r = d]
= $\left(\frac{22}{7}\times 35\right)$ cm = (22 $\times$ 5) = 110 cm
Hence, the circumference of the given circle is 110 cm.

(ii) Here, d = 4.9 m
Circumference =2π r
= $\left(\mathrm{\pi }d\right)$ [since 2r = d]
= $\left(\frac{22}{7}\times 4.9\right)$ m = (22 $\times$ 0.7) = 15.4 m
Hence, the circumference of the given circle is 15.4 m.