The Trundle wheel is a measuring device used to find the distance from one location to another. The trundle wheel is made up of a wheel (usually with the circumference of one metre), a handle which is attached to the axle of the wheel, and a device which "clicks" every time the wheel makes one complete turn.
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it measures the length or distance
it is used to measure things
Use a trundle wheel or odometer
18.4 inches
A measure of how fast a rotating body is changing its angular position. The average angular speed (w) is obtained by dividing the http://www.answers.com/topic/angular-distance-2 through which the body rotates by the time taken: w = θ/t, where θ = angular distance, and t = time taken in seconds.