Question

find the circumference of a circle whose radius is 7 centimetre.

Answer 1

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$2\pi \: r = circumference$

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$take \: \pi = 22 \div 7$

so,
$2 \times 22 \times 7 \div 7 = 44cm$

so, the circumference is 44 cm

$<font color = blue > hope it helps you$

@ prabhudutt.....