Question

Find the circumference of a cirlce whose radius is 21 cm.​

Answer 1

$Given,Radius \: of \: the \: circle,r=21cm \: </p><p>We \: know \: that,Circumference \: of \: circle =2πr=(2×722×21)cm=(2×22×3)m=132cm</p><p>$

Answer 2

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circumference = 2πr

2×22/7 × 21

44×3

132

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