angle is subtended by arc
71radians — noun The angle subtended at the centre of a circle by an arc of the circle of the same length as the circles radius …
72radian — [ 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 …
73radian — ► 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 …
74degree of curve — a measure of the sharpness of curvature, for United States railroads usually being the angle subtended at the center of curvature by a chord 100 ft. long and for highways by an arc 100 ft. long * * * Railroads. See under curve (def. 5) …
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