Radian
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Definition of Radian, where α is an angle and r is the radius.
A radian is a unit of measuring angles. It is shown by the symbol "rad" or, less often, c (for circular measure). The radian was once an SI unit, but was done away with in 1995.
[edit] Conversion
1 Radian is equal to about 57.2°. There are 6.28 (2π) radians in a full circle. The formula for turning radians to degrees and vice versa is:
or:
we can also say:
.
