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A tractor tyre has a radius of 7cm and it made 1600 complete revolutions on a journey.How many metres did the tyre travel?
12 years ago

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Steve
Keeping track of the units, remember that you can always multiply by 1 and not change anything:

1600revs * 14πcm/rev * 1m/100cm = 703.7m
12 years ago

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