Sorry if my tone was a little off. I realise that theoretical questions have their place, I just find it amusing how many posters on here are unsure of the correct answer, or how to work it out, when it's a very simple shape/curve based question, with very little relevance to day to day operations.
If you're working in GPS mapping or satellite positioning, you need a very thorough understanding of such basic principles, but as has been demonstrated by some of the responses on here, many pilots do not.