I'd recommend bottom-left, to keep it in line with math. Also... if they're ever going to do any trig... like "move laser to 30 degree angle", it'll be a big b

I'd recommend bottom-left, to keep it in line with math. Also... if they're ever going to do any trig... like "move laser to 30 degree angle", it'll be a big boon to keep it exactly in line with what they've learned in school.