Question

find the circumference of a circle whose diameter is 42 cm​

Answer 1

Circumference = 2π r

= 2 * 22/7 * 21

= 2 * 22 * 3.

..... = 44 * 3

= 132

Answer 2

Diameter = 42cm

Radius=21cm

Circumference of circle

$= 2\pi \times r$

$= 2 \times \frac{22}{7} \times 21$

$= 132$