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# Pierres unicycle wheel has a diameter of 80cm. how far does the unicycle move if he turns the wheel once?

The unicycle will move exactly as far as the circumference of the wheel. To work out the circumference you need to calculate 2πr. In this case the radius, r, is 40 which is half of the diameter 80. 2×π×40 is 251.3274 The units are cm, so 251.33cm or 2.51m (to two decimal places)

Roseanna Mcmahon
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