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    Ppie13's Avatar
    Ppie13 Posts: 1, Reputation: 1
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    #1

    Aug 4, 2013, 07:33 PM
    What is the circumference of a circle whose diameter is five eighths of an inch?
    What is the circumference (in fractions of an inch) of a circle whose diameter is five eighths of an inch?
    Wondergirl's Avatar
    Wondergirl Posts: 39,354, Reputation: 5431
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    #2

    Aug 4, 2013, 07:39 PM
    What's the formula for circumference?
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    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Aug 5, 2013, 05:30 AM
    The definition of the special number "pi" is the ratio of a circle's circumference to its diameter. Consequently the circumference of the circle is equal to pi times the diameter. You say the answer should be given in "fractions of an inch" - have they given you a value to use for pi ? Although pi cannot be expressed as a fraction itself, one commonly used approximation for it is 22/7. So this problem boils down to multiplying 5/8 x 22/7.
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