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A Radian is the angle made by taking the radius of a circle and wrapping it along the circle's edge. Therefore 1 Radian is equal to (180/π) degrees. A standard milliradian is 1/1000 of this value. A USSR Mil, however, is 1/6000 of a circle

The radian is an SI derived unit of angle, commonly used in maths and engineering. A radian measures approx. 56.296 degrees (when the arc length is equal to the radius).