Conic Section FINAL 05.01 - NCERT

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238 MATHEMATICS Fig 11. 4 11.2.2 Degenerated conic sections When the plane cuts at the vertex of the cone, we have the following different cases: (a) When α < β ≤ 90o, then the section is a point (Fig1 1.8). (b) When β = α, the plane contains a generator of the cone and the section is a straight line (Fig1 1.9).