[9mm_fan]

Since these things are used so little in the real world, people forget or couldn't be bothered to learn it in the first place, rather just copy it.

Basic maths is needed, but these sorts of equations are obnoxious.

I don't think it is obnoxious in the slightest but it's something that people should simply should know due to how basic it is.

I think equations like this are the equivalent to riding a bicycle. I never ride a bike anymore but I still remember how to do it.