Posted by keisha on Monday, November 12, 2007 at 9:09am.
Find the lateral and surface area of the right rectangular prism whose length is 7 cm, width is 5 cm, and height is 1.5 cm.
I think the answer is 36 for lateral area and 106 as surface area. I made a formula, 2(7 x 1.5 + 1.5 x 5)) and I got 36. Then I made another formula, 36 + 2(7 x 5) and I got 106. Is this right?

math  PsyDAG, Monday, November 12, 2007 at 9:46am
I didn't check the math, but the formulas are right. I hope this helps. Thanks for asking.

math  drwls, Monday, November 12, 2007 at 12:47pm
The "sides" (lateral) dimensions depend upon which side is up. You did not count the larger surface areas at the top and bottom when computing lateral area, and that is probably OK. The total area of the six sides is 2[(7x5) + (1.5x5) =(7x1.5)] = 106 cm^2
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