Question

5. Find the circumference of the circle whose diameter is :
4.2 cm (ii) 7 cm
(ii) 9.8 cm
22
Take it =
7​

Answer 1

Circumference = 2πr

1. r = d/2 = 4.2/2

2 × 22/7 × 4.2/2 = 13.2 cm

2. r = 7/2

2 × 22/7 × 7/2 = 22 cm

3. r = 9.8/2

2 × 22/7 × 9.8/2 = 30.8 cm