I can provide a couple of better screen shots if needed. And I don't have to answer #5. Here are some relevant questions/attempts at answers (the ones I didn't ask about are the ones I need most help with): 1. a) Are you basically just taking the circumference equation and changing it around to make a radius one? i.e C/2π = r 1. c) You apply Pythagora's theorm? 3. b) Would it have anything to do with corresponding angles? (probably not) 4. I live in Toronto, Ontario, Canada and the answer is most likely yes. Once I've found the circumference at my latitute, would I simply divide by 24 (because that's how many hours are in a day) to get km per hr? Sorry if I'm not being clear in some areas. And thanks in advance to anyone who can help.