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For the string to wrap around the cylinder and yet do so by "coiling" around the outside of the cylinder from bottom to top, it will need to be 150cm long.

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โˆ™ 2008-12-27 12:37:01
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Q: A cylinder 90 cm high has a circumference of 20 cm A string makes exactly 6 complete turns round the cylinder while its two ends touch the cylinder's top and bottom how long is the string in cm?
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