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)

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Roseanna Mcmahon
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