When 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 (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...
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 Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers...
Radian Measure is one of the units for measuring angles in mathematics. Click here to learn more about radian measure, how to calculate angle measurements in terms of radians.
美['reɪdiən] 英['reɪdiən] n.弧度 网络弪;弪度;弧度制 复数:radians 权威英汉双解 英汉 英英 网络释义 radian n. 1. 弧度a unit used to measure an angle, equal to the angle at the centre of a circle whose arc is the same length as the circle's radius...
Radian definition: the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbreviation. See examples of RADIAN used in a sentence.
Radians are generally measured in terms ofπsince they are related to an arc length on a circle. The circumference of a circle is defined as2πr. Since the arc length and angle measurement in radians is equivalent, and the radius in a unit circle is 1, there are2π(1), or2πradians...
Definition of Radian Radian describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle Definition of Degree ...
Radians are often expressed using their definition. The formula to find an angle in radians isθ = s/r, where the angle in radiansθis equal to the arc lengthsdivided by the radiusr. Thus, radians may also be expressed as the formula of arc length over the radius. ...
Radian describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle ...
Note: 360° equals 2π radians because a complete circular arc has length equal to 2π times the radius. Formula: θ =s/r θ = measure of thecentral anglein radians s= arc length r= radius of the circle Example: s= 10 r= 5 ...