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  1. #1
    Platinum Lounger
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    How long is a piece of string?

    A cylinder 48 cm long has a circumference of 16 cm. A string makes exactly 4 complete turns round the cylinder while its two ends touch the cylinder's top and bottom. How long is the string in cm?

    Alan

  2. #2
    WS Lounge VIP sdckapr's Avatar
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    Re: How long is a piece of string?

    <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">80 cm = 4 * sqrt((48/4)

  3. #3
    3 Star Lounger
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    Re: How long is a piece of string?

    The basis of Skytale encryption.

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