Hey guys, recently my team (237) gave me the Robovation kit. I'm still looking around the source code, but i'm starting to understand it. Right now I'm trying to make a function that'll make it turn 90 degrees. I have a good idea on how to do it via the programming aspect, but im mind blocked on the math part.
Heres a pic I drew in paint.
Whats the formula to figure out how many times the wheel needs to turn to go 90 degrees? I'm sure I can just go manually turn it and figure it out, but the formula would be better when I need to have it turn other angles.

I probably didn't make much sense... it's a saturday.