Question

Find the circumference of a circle whose radius is 7cm .​

Answer 1

Fact: circumference of a circle whose radius is r is given by 2πr

Here r=7 cm

Hence circumference of the circle =2π(7)=2⋅

7

22

⋅7=2⋅22=44 cm

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Answer 2

Given: The radius of the circle is $7$cm.

We have to find the circumference of a circle.

As we know that the formula to calculate the circumference of a circle is$C=2 \pi r$.

We are solving in the following way:

We have,

$r=7$cm.

$\therefore$ The circumference of a circle will be:

$=>C=2 \pi r\\=>C=2 \times \pi \times 7 \\=>C= 43.9823 \mathrm{~cm}$

Hence, the circumference of a circle will be$43.9823 \mathrm{~cm}$.