Conic sections, treated geometricallyDeighton, Bell, 1875 - 262 Seiten |
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AC² asymptotes auxiliary circle BC² bisects the angle Cambridge CD² centre chord of contact circular section cone confocal conic section conics intersect conjugate diameters conjugate hyperbola constant ratio curvature draw drawn parallel ellipse equally inclined Fcap fixed point focal chord focal distances foci focus given point given straight line harmonic range Hence latus rectum line joining locus meet the axis meet the curve meet the directrix meet the tangent middle point nine-point circle normal parabola parallelogram passes perpendicular plane PN² point of intersection point Q points of contact polar produced meet PROP prove rectangle rectangular hyperbola right angles semi-latus rectum shew shewn subcontrary subtends tangents be drawn theorem touching transverse axis triangle Trinity College vertex
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