Two Geometrical Memoirs of the General Properties of Cones of the Second Degree and on the Spherical ConicsGrant and Bolton, 1841 - 112 páginas |
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appears arc joining arcs be drawn arcs drawn assumed asymptotes axes axis centre chord circle circular sections conic section conjugate consequently consider constant contained corresponding curve cyclic arc cyclic plane deduce determine diameter director arc distance edges ellipse envelope equal angles equation extremities faces fixed arcs fixed planes fixed point focal line foci focus formulæ four geometry give given conic given point given right line greatest Hence hyperbola intercepted intersection lead least locus lying meet moveable normal origin parallel perpendicular plane be drawn plane passing point of concourse points of contact polar pole preceding principal properties proved quadrilateral radii radius ratio reference respectively right angles right line second cone second degree segment sides sines sphere spherical conic spherical triangle supplementary surface tangent arcs tangent planes theorems third tion touching traces transversal trihedral angle turn round vector arcs vertex vertices