1) Line roulette 2) Roulette
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https://www.crosswordclues.com/clue/hypocycloid
In geometry, a hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. It is comparable to the cycloid but instead of the circle rolling along a line, it rolls within a circle. ==Properties== If k is an integer, then the curve is closed, and has k cusps (i.e., sharp corners,...
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http://en.wikipedia.org/wiki/Hypocycloid
• (n.) A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf. Epicycloid, and Trochoid.
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http://thinkexist.com/dictionary/meaning/hypocycloid/
A curve formed by the path of a point attached to a circle of radius b that rolls around the inside of a larger circle of radius a. The parametric equations for a hypocycloid can be written as: x = (a - b) cos t + b cos (a/b - 1)t, y = (a - b) sin t - b sin (a/b - 1)t. The type of hypocloid depend...
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http://www.daviddarling.info/encyclopedia/H/hypocycloid.html
Hy`po·cy'cloid noun [ Prefix
hypo- +
cycloid : confer French
hypocycloïde .]
(Geom.) A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Confer
Epicycloid , and
Trochoid .
Found on
http://www.encyclo.co.uk/webster/H/83
[
n] - a line generated by a point on a circle that rolls around inside another circle
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http://www.webdictionary.co.uk/definition.php?query=hypocycloid
a curve generated by the motion of a point on the circumference of a circle that rolls internally, without slipping, on a given circle.
Found on
https://www.infoplease.com/dictionary/hypocycloid
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