Circle points rolling along straight lines make curves {cycloid}. Circle points rolling on fixed-circle outsides make curves {epicycloid}. Circle points rolling on fixed-closed-curve outsides make curves {pericycloid}. Circle points rolling on fixed-circle insides make curves {hypocycloid}. Fixed circles can have four times rolling-circle diameter {astroid}.
Mathematical Sciences>Geometry>Plane>Curve>Kinds>Rolling
3-Geometry-Plane-Curve-Kinds-Rolling
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Date Modified: 2022.0224