Question

what is meant by a radian?

Answer 1

Answer: 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.

Answer 2

Radian describe 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 centre of a circle by an Arc that is equal in length to the radius of the circle.

In units: Dimensions with an Arc length to the radius I.e.,

$1 \frac{m}{m}$

Unit of: Angle

Unit system: SI derived unit