radian length

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• radian — [rā′dē ən] n. [< RADIUS] the basic unit of plane angle in the SI system, equal to 57°, 17′, 44.8″ (57.29578°, the angle formed at the center of a circle by two radii cutting off an arc whose length is equal to the radius of the circle): one… …   English World dictionary

• radian — ► NOUN ▪ a unit of measurement of angles equal to about 57.3°, equivalent to the angle subtended at the centre of a circle by an arc equal in length to the radius …   English terms dictionary

• Radian — For other uses, see Radian (disambiguation). mrad redirects here. For millirads, see Rad (unit). An angle of 1 rad …   Wikipedia

• radian — (rad)    a unit of angle measure widely used in mathematics and science. One radian is the angle at the center of a circle that cuts off an arc of length equal to the radius. Since the circumference equals 2 pi times the radius, one radian equals …   Dictionary of units of measurement

• radian — A supplementary SI unit of plane angle. [L. radius, ray] * * * ra·di·an rād ē ən n a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc equal in length to the radius * * * ra·di·an (rad)… …   Medical dictionary

• radian — The angle subtended at the center of a circle by an are equal in length to its radius. A radian is an SI (Système international d’unités, or international system) unit most commonly used in sight calculations and other aiming problems. Its short… …   Aviation dictionary

• radian — noun Date: 1879 a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 57.3 degrees …   New Collegiate Dictionary

• radian — /ray dee euhn/, n. Math. the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbr.: rad [1875 80; RADI(US) + AN] * * * …   Universalium

• radian — noun In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the …   Wiktionary

• radian — reɪdɪən n. central angle of an arc of any circle that is equal in length to the radius of the same circle (Mathematics) …   English contemporary dictionary

• radian — [ reɪdɪən] noun a unit of measurement of angles equal to about 57.3°, equivalent to the angle subtended at the centre of a circle by an arc equal in length to the radius …   English new terms dictionary