Angular Displacement

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A body moves around the orange circle of radius through an angle
measured in radians. The distance it travels along the arc is
. This is shown as a blue arc and an equal blue line segment. The light-blue disk has a radius of unity for comparison.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Angular Displacement"
http://demonstrations.wolfram.com/AngularDisplacement/
Wolfram Demonstrations Project
Published: March 7 2011