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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

4mo ago

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lenpollock

Lvl 16
1w ago

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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Wiki User

14y ago

132cm

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Q: What is the circumference of a circle with radius of 21 cm?
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Related questions

The circumference of a circle is 132cm what is the radius of the circle in centimeters?

To find the radius of a circle when given the circumference, you can use the formula for the circumference of a circle: C = 2πr, where C is the circumference and r is the radius. Given that the circumference is 132 cm, you can plug this value into the formula: 132 = 2πr. To solve for the radius, divide both sides by 2π: r = 132 / (2π) ≈ 21 cm. Therefore, the radius of the circle is approximately 21 centimeters.


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