About the Units
radian (rad)
The standard unit of angular measure, defined by the ratio of arc length to radius (approximately 57.2958 degrees).
second (″)
An angular measure equal to 1/60 of a minute or 1/3600 of a degree, used for very precise measurements.
Common Conversions
- 1 rad = 206264.8 ″
- 0.000004848137 rad = 1 ″