Convert the angle `ANGLE.deg`° to radians.

There are `360`

degrees in a circle. There
are also `2\pi`

radians in a circle.

In other words, there are `\pi`

radians per
`180`

degrees. So we can convert from
degrees to radians by multiplying by `\pi`

,
and dividing by `180^\circ`

.

```
```

`ANGLE.deg`^\circ
\times \dfrac{\pi}{180^\circ}

`\displaystyle = `

radians
`ANGLE.rad`