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abstraction > mathematical concept > geometrical object > conic section > ellipse > circle
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circle
subjectfact 
circlehas definition An ellipse possessing but one focus.has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:32:37.0
is a kind of ellipse2001-09-27 09:32:37.0
conic sectionhas dimensions 22001-09-27 09:32:37.0

Kinds of circle :