16 Dec
2010
16 Dec
'10
1:27 p.m.
I don't understand this point in the argument. Why can't the shadow change shape, in a way other than rotating, that keeps the area constant?
Yes, I misunderstood the original problem, and thought that he was referring to solids where the shadow is a constant *shape*, rather than area. Sincerely, Adam P. Goucher