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 = ANGLE.rad
radians