October 8, 2015

Homework Help: math

Posted by Elie on Monday, May 7, 2012 at 10:29pm.

Make a model of a rectangular prism that is not a cube and has a surface area of 62 cm squared. What are the measurements of this rectangular prism?

I know the formula, is 2ab+2bc+2ac=sa, and I know the answer to this problem... a=5, b=3, and c=2... I did this by trial and error, and I know that there has to be a simpler way. I am trying to teach my 5th grader how to find the solution to this problem, and I don't know how to do it without just doing trial and error. If someone could explain this to me so that I could teach him, I'd really appreciate it. Thanks in advance.

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