File:Orthoptic locus of a circle, ellipses and hyperbolas.gif
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Orthoptic_locus_of_a_circle,_ellipses_and_hyperbolas.gif (328 × 328 pixels, file size: 933 KB, MIME type: image/gif, looped, 96 frames, 24 s)
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[edit]DescriptionOrthoptic locus of a circle, ellipses and hyperbolas.gif |
English: Orthoptic locus (red circle) of a circle (e=0), ellipses (e<1) and hyperbolas (e>1) for different eccentricities. For a circle and an ellipse orthoptic locus is a circle, and for a hyperbola with eccentricity less than a square root of two it is a circle except four points of intersections with hyperbola's asymptotes (light blue lines). Foci are in magenta, semi-major axis a=4. See problem 27 on page 64 of the following book: A.V.Pogorelov. Geometria. Moskva:Nauka, 1983. See also here. Русский: Геометрическое место (красная окружность) вершин прямых углов, стороны которых касаются данной окружности, эллипса или гиперболы при различных значениях эксцентриситета. Для гиперболы с эксцентриситетом, меньшим, чем квадратный корень из двух, это место — окружность без четырёх точек её пересечения с асимптотами (голубые линии). Фокусы выделены фиолетовым, большая полуось a=4. См. упражнение 27 на стр. 64 следующей книги: А.В.Погорелов. Геометрия. Москва:Наука, 1983. |
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Author | Cmapm |
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