- Physicists usually use radians rather than degrees to measure angles.
- There are 2*pi radians around a circle.
- Radians may sometimes disappear as units in a problem, especially in angular velocity or angular acceleration.
- Angular distance (radians) is analog to linear distance (meters).
- Angular velocity (radians/sec) is analog to linear velocity (meters/sec).
- Angular accleration (radians/sec^2) is analog to linear accleration (meters/sec^2).
- Equations of rotational kinematics are very similar to those of linear kinematics.

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