math

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

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asked by jenna
  1. what is the formula PI*diameter=Cicumference used for?

  2. i am confused??

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    posted by jenna
  3. the pi is 3.14

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    posted by jenna
  4. C=PI*diameter.

    You need to get this down.

  5. 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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    posted by jenna

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