Java.Math: tangent with gradient

Hi all,
I need to get an trigonometric tangent with a gradient, but in the class lang.Math is only a method that needs a radian for input. Can I convert the value of the gradient into a radian value to work with the existing methods? Or is there any other "easy" way that solves my problem?
Thanks a lot...

I got two selfmade draw-objects with their central point. Now I can make the quotient of the x- and y-distances between the two points. But I need the angle of the "slope triangle" (dont know if this is the correct denotation) for the further computation. Every tiny calculator can make a tangent of this quotient (I thought it would be called gradient then, its 1 for a 45 degree...), but I can't figure out how to do this with Java...

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