Math Geo

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Estimate the radius of a circle with the circumference of 272.2 inches. Help me with the steps please?

  • Math Geo -

    C = pi * d

    272.2 = pi * d

    272.2/pi = d

    use 3.14 for pi

  • Math Geo -

    C = pi * 2r
    272 = 3 * 2r
    272 = 6r
    272/6 = r
    45 = r

  • Math Geo Ms Sue -

    Ms Sue,


    I understand it now , but my choice answers none are 45? I followed your steps and got the same answer as you.
    But your calculations are right.

    Choices are :

    43.3 in.
    136.1 in.
    86.7 in.
    5887.2 in

    So not sure why ?

  • Math Geo -

    hahah never mind I got it. Estimation!

    So 43.3 in. is the answer. Forgot. Thanks.

  • Math Geo -

    Ugghh!

    Of course you're right, but I don't like the answer choices with decimals. In my opinion, estimates should not involve decimals.

  • Math Geo -

    Answer is 43.3 A

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