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9 July, 10:53

How can you calculate the circumference if you know the circle's radius?

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Answers (2)
  1. 9 July, 11:03
    0
    Set up the formula for the area of a circle.

    The formula is A = πr^2 {A=/pi r^{2}}, where A equals the area of the circle, and r equals the radius. Solve for the radius ...

    Plug the area into the formula ...

    Divide the area by ...

    Take the square root.
  2. 9 July, 12:22
    0
    The circumference is the radius times 2 times 3.14
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