I think I discovered a tiny problem in your 'relative proportions' formula picture. you have y' y - = - z' z' in the first line. The z' on th

I think I discovered a tiny problem in your 'relative proportions' formula picture. you have y' y - = - z' z' in the first line. The z' on the bottom right should be just a z, right? Other than that, this is perfectly clear, and I understood it even though I just came out of high school and haven't started college yet! Absolutely fantastic work! EDIT: Fraction format