Affine geometry | Conic sections

Conjugate diameters

In geometry, two diameters of a conic section are said to be conjugate if each chord parallel to one diameter is bisected by the other diameter. For example, two diameters of a circle are conjugate if and only if they are perpendicular. (Wikipedia).

Conjugate diameters
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Related pages

Perpendicular | If and only if | Ellipse | Parallel (geometry) | Time | Point at infinity | Chord (geometry) | Circle | Lemma (mathematics) | Pole and polar | Shear mapping | E. T. Whittaker | Parallelogram | Proposition | Asymptote | Analytic geometry | Diameter | Point-pair separation | Hyperbola | Pappus of Alexandria | Bisection | Area | Projective geometry | Conic section | Geometry | Reflection (mathematics) | Space | Isaac Newton | Hyperbolic orthogonality | Unit hyperbola | Rytz's construction