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The circumference is 42.83 because

circumference = 2 x pi x r

2 x 2.1415927 x 10 = 42.83

Improved answer:

Circumference of a circle = 2*pi*radius or pi*diameter

Circumference = 20*pi = 62.83185307 units or 63 to the nearest unit.

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Q: What is the circumference if the radius is 10?
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