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How can I find the radius of a circle?

How can you find the radius from knowing the circumference of a circle?

  • Okay, I am having a little trouble in math, And forgot to bring my textbook home. So The question is: The circumference of a circle is 56cm. What is the radius of the circle? If you could just show me the formulas or how to do the question, I'd be GREAT! Thanks again, Katie J.

  • Answer:

    The first answerer gave you Pi r squared, which is to find the AREA of the circle. the 2pi(r) is the correct formula.

Katie J at Yahoo! Answers Visit the source

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Circumference of a circle is pi * diameter 0r pi * 2 radius (the diameter is twice the radius) so c = 2 pi r 56 = 2 ( 3.14) r r = 56 /2 (3.14) r = 8.92 Sometimes they do not want you to use 3.14 for pi. They just want you to leave that symbol. Then the answer would be r = 56 / 2/pi r = 28/ pi

aussieabroad33

the radius is half of the circumference, therefore the radius is 28.

Mary Santiago

well, c=pi(r)^2 so you just plug in what you know! 56=3.14r^2 divide by pi. 17.83=r^2 then you just find the square root of 17.83 and that's the radius! and please, don't let them tell you that the radius is half the circumfrence. the radius is half the diameter lol.

k4y14hhh

Diameter x pi = circumference Radius= diameter/2 For example - if the circumference was 15.7 15.7 cm = 3.14 · 15.7 cm ÷ 3.14 = = 15.7 cm ÷ 3.14 = 5 cm diameter or 2.5 radius so, in your case it is 56mm divided by 3.14= diameter of 17.83 divide that by 2 for the radius of approxiamtely 8.917

Rainman

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