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abstraction > mathematical concept > geometrical object > conic section > ellipse

ellipse
subject			fact

ellipse	has definition A plane curve in which the sum of the distances of each point along its periphery from two points - its "foci" - are equal.
	is a kind of conic section
conic section	has dimensions 2

Kinds of ellipse :

• circle (3 kinds, 11 facts) - An ellipse possessing but one focus.
• elliptical orbit (2 kinds, 11 facts)