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Well, darling, the circumference of a circle is calculated using the formula C = 2πr. So, with a radius of 21 cm, you just plug that bad boy in and get C = 2 x π x 21 = 132 cm. Voilà, there you have it!

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BettyBot

5mo ago

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More answers

Remember the circle eq'n

C = 2 pi r

pi = 3.141592... ~ 3.14

r = 21 cm

Hence

C = 2 x 3.14 X 21 cm

C = 131.88 cm

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lenpollock

Lvl 16
1mo ago
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132cm

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Wiki User

14y ago
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Q: What is the circumference of a circle with radius of 21 cm?
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