Is there an ArcTan function?

[amantle]

I need to convert percent slope to degrees and would prefer not to use a table...I would like to use a formula, but I think I need to use a ArcTan to convert percent slope to degrees:
Slope Degrees = ArcTan (Slope)

I do not see an ArcTan function in Basic4PPC. Am I missing this?
Does anyone know another way to arrive at the answer?
Thanks so much!

 

[Erel]

It is named ATan.

degrees = 180 / cPI * ATan(slope)

 

[jmantle]

Thanks

Appreciate that!