Question

The radius of a circle is 21 cm. Find its circumference ( take pi = 3 1/7

Answer 1

Step-by-step explanation:

given

radius of circle=21cm

so,

circumference of circle

here π=3whole1/7=22/7

=2πr

=2*22/7*21

=2*22*3

=132cm

I hope it will be helpful

Answer 2

Given ,

Radius of circle = 21 cm

We know that , the circumference of circle is given by

$\large \mathtt{ \fbox{Circumference \: of \: circle = 2\pi r}}$

Substitute the value , we obtain

$\sf \hookrightarrow Circumference = 2 \times \frac{22}{ \cancel7} \times { \cancel{21}} \\ \\ \sf \hookrightarrow Circumference = 44 \times 3 \\ \\ \sf \hookrightarrow Circumference = 132 \: cm$

Hence , the circumference of circle is 132 cm