A rotating wheel has been used to measure distance since ancient times.


circumference of a wheel in meters =

= PI() * (diameter of the wheel in meters)


distance in meters =

= (circumference of the wheel in meters) * (number of rotations)


number of rotations =

= (distance in meters) / (circumference of the wheel)


If the wheel is rotating at a constant speed:


number of rotations =

= (number of rotations per unit of time) * (unit of time)


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