- Types:
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circle
ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point
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circle of curvature, osculating circle
the circle that touches a curve (on the concave side) and whose radius is the radius of curvature
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circlet
a small circle
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equator
a circle dividing a sphere or other surface into two usually equal and symmetrical parts
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epicycle
a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
