Maybe I should think about plastics
I'm starting to wonder a bit if this job is for me... I just spent a good fifteen minutes trying to remember the equation for plotting a circle. Succeeding in that, I realized that the reason I was getting crazy bizarre results is that I'd forgotten how to include the radius as a variable.
Of course, each time I spent about five minutes trying to figure out the craziest result I could get from inputting different radii.
Having to teach myself all the MATLAB stuff that's actually useful would be enough work without being haunted by shades of forgotten geometry.
EDIT: No, I was attempting to include the radius correctly. I was just failing in practice, giving me a circle defined by x = r*cos(theta) and y = sin(r*theta). Which, as I'm sure you can imagine, is wrong.