Radian

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Definition of Radian, where a 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 2π radians in a full circle. The formula for turning radians to degrees and vice versa is:

or:

we can also say:

.

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