| 释义 |
radian
 radianWhen the length of an arc of a circle is equal to the radius of the circle, the angle subtended by that arc equals one radian.ra·di·an R0011100 (rā′dē-ən)n. Abbr. rad A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17′44.6".
[radi(us) + -an.]radian (ˈreɪdɪən) n (Units) an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle. Symbol: rad [C19: from radius]ra•di•an (ˈreɪ di ən)
n. the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbr.: rad [1875–80] ra·di·an (rā′dē-ən) A unit of angular measure equal to a little more than 57°. This is the measure of an angle whose vertex is the center of a circle and whose two rays intersect the circle so as to form an arc with the same length as the circle's radius.Thesaurus| Noun | 1. | radian - the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)radangular unit - a unit of measurement for anglesmilliradian - a unit of angular distance equal to one thousandth of a radian |
Translations
radian
radian an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle radian (ray -dee-ăn) A unit of angle used in plane geometry that is the angle subtended at the center of a circle by an arc of the circle equal in length to the circle's radius. Thus 2π radians equals 360°, 1 radian equals 57°.296, and 1° equals 0.017 radians. Solid angles, used in spherical geometry, are measured in steradians.Radian the central angle subtended in a circle by an arc whose length is equal to the circle’s radius. A radian is approximately equal to 57°17′44.8″. The radian is used as the unit of measurement of angles in what is known as circular, or radian, measure. If the circular measure of an angle is a radians, the angle contains (180a/π)°. Conversely, if the degree measure of an angle is n°, the circular measure is πn/180 radians. For example, angles of 30°, 45°, 60°, 90°, and 180° correspond to angles of π/6, π/4, π/3, π/2, and π radians, respectively. radian[′rād·ē·ən] (mathematics) The central angle of a circle determined by two radii and an arc joining them, all of the same length. radianThe angle subtended at the center of a circle by an arc 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 form is rad, and its value is equal to 57°17'44.8”, or one rad = 57.2958°.radian
ra·di·an (rad), (rā'dē-ăn), A supplementary SI unit of plane angle. [L. radius, ray] ra·di·an (rad) (rā'dē-ăn) A supplementary SI unit of plane angle. [L. radius, ray]radian (rā′dē-ăn) 1. A unit of angular measurement equivalent to 57.295 degrees. It is subtended at the center of a circle by an arc the length of the radius of the circle. 2. In ophthalmometry, a lens of 1 radian would have one plane surface equal in length to the radius of curvature of the curved surface.See RAD
See RADradian
Synonyms for radiannoun the unit of plane angle adopted under the Systeme International d'UnitesSynonymsRelated Words |