Syntax
RADIANS(angle)
| Parameter | Description |
|---|---|
| angle | Parameter of the RADIANS function. |
Examples
180 degrees to radians
Formula
=RADIANS(180)
Returns ~3.14159 (π). 180 degrees is exactly π radians.
Use with SIN
Formula
=SIN(RADIANS(30))
Returns 0.5. Converts 30° to radians first, then computes sine. This is cleaner than =SIN(30*PI()/180).
Right angle
Formula
=RADIANS(90)
Returns ~1.5708 (π/2). 90 degrees is π/2 radians.
Common Errors
#VALUE!
Non-numeric input returns #VALUE!. The argument must be a number.
Tips
Always use with trig functions
=SIN(30) is almost certainly wrong (30 radians ≈ 1,719°). You almost always want =SIN(RADIANS(30)) when working with degree values.
Manual conversion
RADIANS(x) = x × PI() / 180. The function is a convenience wrapper for this formula.
Common conversions
RADIANS(45)=π/4, RADIANS(90)=π/2, RADIANS(180)=π, RADIANS(360)=2π. These are the most-used conversions.
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