The r (Radian Symbol) Command

Command Summary

If the calculator is in degree mode, the r (radian) symbol converts a radian angle to degrees.

Command Syntax


Menu Location


  1. 2nd ANGLE to access the angle menu.
  2. 3 to select r, or use arrows and ENTER.

Calculator Compatibility


Token Size

1 byte

NOTE: Due to the limitations of the wiki markup language, the r command on this page does not appear as it would on the calculator. See Wiki Markup Limitations for more information.

Normally, when the calculator is in degree mode, the trigonometric functions only return values calculated in degrees. With the r symbol you can have the angle evaluated as if in radian mode because it converts the angle into degrees.

One full rotation around a circle is 2π radians, which is equal to 360°. To convert an angle in radians to degrees you multiply by 180/π, and to convert from degrees to radians multiply by π/180.

In degree mode:

sin(π)        \\sine of Pi degrees

In radian mode:
    0        \\There's no difference when in radians


When you only call the trig function once in a program and want it calculated in radians, instead of changing the mode you can just use ° to save one-byte (the newline from using the command Radian)

can be

Related Commands

  • ° (degree symbol)


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