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You're supposed to know that

Circumference = (pi) x (diameter)

Divide each side of this equation by (pi) :

Diameter = Circumference/pi

And you also know that Diameter = 2 x Radius .

2 x Radius = Circumference/pi

Divide each side of that one by 2 :

Radius = Circumference/2 x pi .

and that's exactly what you need.

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Wiki User

12y ago

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More answers

Remember the circle equations.

C = pi d

or

C = 2 pi r

NB d = 2r

By algebraic rearrangement

r = C / (2 pi)

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lenpollock

Lvl 16
11mo ago
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Q: How do you find radius with given circumference?
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