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math

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what is the exact circumference of a circle with a diameter of 13 inches?

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    what is the formula PI*diameter=Cicumference used for?

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    i am confused??

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    the pi is 3.14

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    C=PI*diameter.

    You need to get this down.

  • math - ,

    okay but the options i have to choose from are:

    a. 26Pi in.
    b. 6.5Pi in.
    c. 13Pi in.
    d. 42.25Pi in.
    e. 169Pi in.

    i think it's a. right?

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