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Main topics discussed in Class 11 Mathematics chapter- Conic Section are: Sections of a Cone; Circle, ellipse, parabola and hyperbola; Degenerated conic sections ...
Chapter 11: Conic Sections ⇒ Circles, ellipse, parabola, hyperbola, a point, ⇒ A straight line and a pair of intersecting lines as a degenerated case of a conic section.
Class 11 Latest NCERT Maths Textbook: ... Chapter 11: Conic Sections . 248. 11.5.2 Special Cases of an Ellipse . Chapter 12: Introduction to Three Dimensional Geometry. 273–276. 277.