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• Minimum railway curve radius — 90 foot (27.43 m) radii on the elevated 4 ft 8 1⁄2 in (1,435 mm) Chicago L . There is no room for longer radii at this street intersection The minimum railway curve radius, the shortest design radius, has an… …   Wikipedia

• Base curve radius — Base curve radius, abbreviated BCR or BC, is a parameter of a contact lens. Typical values are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the contact lens that the prescription describes. Contact lenses must… …   Wikipedia

• Radius of curvature (optics) — Radius of curvature has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located in (x, y, z) either along or decentered from the system local optical axis. The vertex… …   Wikipedia

• Radius of curvature — may refer to: Radius of curvature (mathematics) Radius of curvature (optics) Radius of curvature (applications), in geodesy and materials science The reciprocal of the curvature, in differential geometry Radius, for a sphere (lingo) The radius of …   Wikipedia

• Radius — For other uses, see Radius (disambiguation). Circle illustration In classical geometry, a radius of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such… …   Wikipedia

• Radĭus — (lat.), 1) Strahl; 2) Speiche am Rad u. an den Armknochen; 3) eine vom Mittelpunkte einer krummlinigen Figur (bes. Kreis u. Ellipse) nach seinem Umfange gezogene Linie. In so fern sich um jedes regelmäßige Vieleck ein Kreis beschreiben läßt,… …   Pierer's Universal-Lexikon

• Radius vector — Ra di*us vec tor (v[e^]k t[o^]r). 1. (Math.) A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points …   The Collaborative International Dictionary of English

• radius — ► NOUN (pl. radii or radiuses) 1) a straight line from the centre to the circumference of a circle or sphere. 2) a radial line from the focus to any point of a curve. 3) a specified distance from a centre in all directions: pubs within a two mile …   English terms dictionary

• radius vector — n. pl. radii vectores [vek tôr′ēz] or radius vectors 1. a straight line joining the origin of a vector, located at the intersection of two coordinates, to a given point lying in the same plane 2. a vector whose point of origin is fixed and whose… …   English World dictionary

• Radius — Radius, lat. (Strahl) oder Halbmesser, nennt man bei der Kugel und den krummen Linien den halben Durchmesser. Beim Kreise u. der Kugel sind alle Radien einander gleich. – R. vector, bei der Ellipse oder Parabel eine von dem Brennpunkte nach… …   Herders Conversations-Lexikon

• Radius of curvature (applications) — The distance from the center of a sphere or ellipsoid to its surface is its radius. The equivalent surface radius that is described by radial distances at points along the body s surface is its radius of curvature (more formally, the radius of… …   Wikipedia

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