tangent pencil
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Apollonian circles — Some Apollonian circles. Every blue circle intersects every red circle at a right angle. Every red circle passes through the two points, C and D, and every blue circle separates the two points. This article discusses a family of circles sharing a … Wikipedia
List of QI episodes (A series) — infobox tvseason season name = QI Series A caption = The front cover of the QI Series A DVD, featuring Stephen Fry (right) and Alan Davies (left). dvd release date = 6 November 2006 country = UK network = BBC first aired = 11 September 2003 last… … Wikipedia
Ellipse — Elliptical redirects here. For the exercise machine, see Elliptical trainer. This article is about the geometric figure. For other uses, see Ellipse (disambiguation). Not to be confused with ellipsis. An ellipse obtained as the intersection of a… … Wikipedia
Hyperbola — This article is about a geometrical curve, a conic section. For the term used in rhetoric, see Hyperbole … Wikipedia
Lie sphere geometry — is a geometrical theory of planar or spatial geometry in which the fundamental concept is the circle or sphere. It was introduced by Sophus Lie in the nineteenth century. [The definitive modern textbook on Lie sphere geometry is Harvnb|Cecil|1992 … Wikipedia
List of QI episodes (C series) — infobox tvseason season name = QI Series C caption = The front cover of the QI series C DVD, featuring Stephen Fry (left) and Alan Davies (right). dvd release date = 1 September 2008 country = UK network = BBC first aired = 30 September 2005 last … Wikipedia
Circles of Apollonius — Apollonian circle redirects here. For a subdivision of this subject, see Apollonian circles. The term circle of Apollonius is used to describe several types of circles associated with Apollonius of Perga, a renowned Greek geometer. Most of these… … Wikipedia
Dan Jurgens — Born June 27, 1959 (1959 06 27) (age 52) Ortonville, Minnesota Nationality American Area(s) Penciller, Inker, Writer … Wikipedia
Conic section — Types of conic sections: 1. Parabola 2. Circle and ellipse 3. Hyperbola … Wikipedia
Optical aberration — v · d · e Optical aberration … Wikipedia
Neal Adams — For the American football player, see Neal Adams (American football). Not to be confused with Neil Adams. Neal Adams Adams at the Big Apple Con, November 15, 2008. B … Wikipedia
