The radius of a circle is $21\ cm$. Find the circumference $(Take\ \pi=\frac{22}{7})$.

Academic Mathematics NCERT Class 10

Given: The radius of a circle is $21\ cm$.

To do: To find the circumference.

Solution:

Circumference $=2 \pi r$

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

$=2 \times 22 \times 3$

$= 44 \times 3$

$= 132\ cm$

Thus, circumference of the circle is $132\ cm$.

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Updated on: 10-Oct-2022

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