Converts an angle to radians, if necessary.

*angle* ^{r}

**Menu Location**

- Press 2nd MATH to enter the MATH popup menu.
- Press 2 to enter the Angle submenu.
- Press 2 to select
^{r}.

This command works on all calculators.

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.

The ^{r} symbol used after an angle makes sure the angle is interpreted as being in radians. If the calculator is already in radian mode, x^{r} is equal to x; in degree mode, x^{r} is equal to 180*x/π; and in gradian mode, x^{r} is equal to 200*x/π.

If you're using radian angle measures extensively in a program, it's a better idea to use setMode() to switch to radian mode and not worry about this. However, there are two reasons you might want to use ^{r}:

- If you need an angle in radians only once or twice, don't bother changing the mode setting.
- In a function, you're forced to use
^{r}, since setMode() isn't valid in a function.

Make sure to use parentheses around an expression like (π/3)^{r}, since π/3^{r} will be interpreted as π/(3^{r}), and the conversion will be done incorrectly.

In radian mode (no conversion is necessary, so no conversion is done):

```
:sin(π/6)
1/2
:sin((π/6)^r)
1/2
:π^r
π
```

In degree mode:

```
:sin(π/6)
sin(π/6)
:sin((π/6)^r)
1/2
:π^r
180
```