radian length
1radian — [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… …
2radian — ► 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 …
3Radian — For other uses, see Radian (disambiguation). mrad redirects here. For millirads, see Rad (unit). An angle of 1 rad …
4radian — (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 …
5radian — 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)… …
6radian — 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… …
7radian — 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 …
8radian — /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] * * * …
9radian — 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 …
10radian — reɪdɪən n. central angle of an arc of any circle that is equal in length to the radius of the same circle (Mathematics) …
