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 57.296o.
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