Math (Area of Shapes)

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Suppose that the spool is 1m long and has an inner diameter of 20 cm and an outer diameter of 60 cm. Approximately, how long a piece of 5 cm thick rope can be wound onto this spool? ( Assume that the rope is wound neatly, in layers. Each layer will consist of a row of "winds" and each "wind" will be approximately a circle.) Explain.

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