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Degenerate conic
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==Relation to intersection of a plane and a cone== Conics, also known as conic sections to emphasize their three-dimensional geometry, arise as the intersection of a [[plane (geometry)|plane]] with a [[cone]]. Degeneracy occurs when the plane contains the [[Apex (geometry)|apex]] of the cone or when the cone degenerates to a cylinder and the plane is parallel to the axis of the cylinder. See [[Conic section#Degenerate cases]] for details.
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