plane angle · International · Modern
Non-SI unit accepted for use with the SI; 1° = π/180 rad.
Converter
plane angle · International · Modern
radian
radexact
- Record
- M432
- Definition quality
- Standardized
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
Radian is the coherent SI unit of plane angle.
Reference value
One radian is equal to 1 radian.
History & use
Used throughout mathematics, physics, and engineering.
Modern use
Current-use record in the project inventory; exact scope should follow the definition and regional/system context shown here.
Did you know?
A full turn is 2π rad.
Sources & evidence
Source tier Tier A · confidence High