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01-10-2006, 10:32 PM
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#38 |
Join Date: Nov 2003
Location: Narnia
Posts: 1,656
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You're answers so far are all correct.
With the cake problem though...remember that for the upper (top of each layer) surface area you only need to calculate one thing - the upper area of the biggest tier. Imagine looking at the cake from directly above. You see all of the top layer, a ring of the second, a ring of the third, etc. If you smushed it all it would be a single layer equal to the bottom. If you understood that it makes it easier. 
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