Degrees and radians
A full turn is 360° = 2π radians, so radians = degrees × π/180 and degrees = radians × 180/π. Trig functions in Excel, JavaScript and Python expect radians, so convert before you call them.
- 90° = π/2 ≈ 1.5708 rad
- 1° = 60′ (arcminutes) = 3,600″ (arcseconds)
- 100 gradians (gon) = 90°