Selected category: angle.

Selected initial unit : radian.

**Definition and details** for radian:

Radian (rad) is the SI unit of angle. It is a derived SI unit, defined as m⋅m^{-1}, which means that angles are dimensionless. 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 π times the radius, one radian equals 1/(2 π) of the circle, or approximately 57.296^{o}.

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