Question

find the circumference of a circle whose radius is 21m

Answer 1

Circumference=2πR (R=Radius)

therefore,

$2\pi \: \times r = x$
$2\pi \times 21$
$2 \times \frac{22}{7} \times 21$
$132m$
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Answer 2

circumference of circle is anwer of 132