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Radian

The radian is a unit (symbol rad) for measuring plane angles, i.e. ordinary two- dimensional angles (often by opposition to solid angles).

To obtain the equivalent in radians of degrees or grades, we use fractions with Pi.

Converting grades to radians

Converting degrees to radians

Definition of the angle in radians. © Maksim, Wikipedia CC by sa 3.0

Definition of the angle in radians. © Maksim, Wikipedia CC by sa 3.0


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