You can write your topic however you want, but you need to answer these questions:

What do you want to achieve? Keep it simple and clear!
I need a function to get turn radius from angular and linear speed 
What is the issue? Include screenshots / videos if possible!
Its for a pathfollowing system using beams. The point to follow cannot be closer than the minimum turning radius. 
What solutions have you tried so far? Did you look for solutions on the Developer Hub?
I just don’t know the math for the described function. I did look for such a function, but couldn’t find it, even in other programming languages.
For anyone who is interested, the function to get a point on a beam can be found here.
(The function looks like it probably works, but I didn’t test it.)