Revolutions to Radians conversion
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Revolution is a unit of angular measure defined as a complete turn around a circle. Revolution angle is equal to 360° or 2π rad. Revolution is abbreviated rev or just r in rpm (revolutions per minute).
Radian is the standard unit of angular measure that defines the ratio between the length of arc and its radius. Radian is a former SI supplementary unit, but since 1995 when this category was abolished it is considered a SI derived unit.