The Cone and Its Sections Treated Geometrically |
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Common terms and phrases
AC² AF.FA anharmonic ratio Asymptotes auxiliary circle axes bisects the angle BRITISH 5 FE centre chord of contact Conic section conjugate diameters conjugate Hyperbola curvature described director circle Draw the tangents drawn parallel Ellipse Ellipse and Hyperbola equal angles Ex æquali F and F fixed point focal chord focal distances foci harmonically divided Hence Hyperbolic sector intersection Latus Rectum lines be drawn lines drawn locus meet the axis meet the curve meet the directrix meet the tangent normal ordinate osculating circle pair of conjugate pair of tangents Parabola parallelogram pass perpendicular point Q points of contact produced to meet Prop prove radius rectangle rectangular Hyperbola right angles segments shown similar triangles similarly straight line subtend tangents be drawn touch trapezium vertex