Teacher2Teacher |
Q&A #19123 |
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Hi Harvey, I usually start by having my students cut a box (rectangular prism) apart so they have the six sides. Then they can tape edges together to make a net for the prism. They notice pretty quickly that there are some congruent sides -- better yet, they remember it, which didn't used to happen when I just told them. From there, it is not a big leap to figuring out how to find the surface area by finding the areas of the sides (faces). I am not familiar with the formula you have used (S = Ph + 2B). I hope this helps. :-) -Gail, for the T2T service
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