Rotating Lines around an Axis or a Circle
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Parallel line segments intersect an axis at right angles. They rotate at a rate proportional to the signed distance from the center point of the axis, creating a helicoid.
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Contributed by: George Beck (March 2011)
Open content licensed under CC BY-NC-SA
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"Rotating Lines around an Axis or a Circle"
http://demonstrations.wolfram.com/RotatingLinesAroundAnAxisOrACircle/
Wolfram Demonstrations Project
Published: March 7 2011