Question

If radius is 21cm what is the circumference?

Answer 1

$hi......$
$here's \: your \: answer.$
$radius \: (r) = 21cm$

$we \: know \: that$

$circumference = 2\pi r$

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

$= 2 \times 22 \times 3$

$=44 \times 3$

$= 132cm.$

so , we get........

Circumference = 132 cm.
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Final Answer :
The circumference of the circle with radius 21cm is 132cm.
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$hope \: \: this \: \: helps....$