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if the diameter of a bike wheel is 20cm, what's the minimum number of revolutions needed to cover 1km?

  • maths -

    1km = 1000 m

    100cm = 1 m

    convert to meters and divide

  • maths -

    Diameter d = 20 cm
    Circumference C = pi * d
    C = 3.14 * 20 = 62.8 cm in one revolution

    62.8 cm
    100 cm = 1m
    62.8/100 = 0.628 m

    0.628 m in one revolution
    1 km = 1000 m
    1000/0.628 = 1592.36 revolutions

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