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| Math Central | Quandaries & Queries |
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Question from Ally: A cylinder has a diameter of 3.5 cm. How many times will a thread 143mm go round the cylinder? |
Hi Ally,
I think you should have both measurements in the same units so express the diameter in millimeters.
If $C$ is the circumference of a circle and $d$ is its diameter then $C = \pi\;d.$ What is the circumference of your cylinder? How many times will a thread of length 143 mm go around that circumference?
Penny
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