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If the radius of a circle is $49\ cm$, find the circumference of the circle.
Given: The radius of a circle is $49\ cm$.
To do: To find the circumference of the circle.
Solution:
As given, radius $r=49\ cm$
So, circumference $=2 \pi r$
$=2\pi \times 49$
$=2\times \frac{22}{7}\times 49$
$=2\times 22\times 7$
$=44\times 7$
$=308\ cm$
Thus, circumference of the circle is $308\ cm$ .
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