Question

The circumference of a circle whose radius is 21cm is
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Answer 1

Answer:

2pie r

2×22/7×21

2×22×3

44×3

132cm

Answer 2

Answer:

Circumference of a circle (C) =

$2\pi \: r$

So, radius = 21 cm (given)

C = 2(22/7) (21)

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

So, C = 132 cm