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Interior Diagonal

Pro Problems > Math > Geometry > Solids > Prisms and Cylinders
 

Interior Diagonal

The length of the interior diagonal of a rectangular prism is given by d =
H2 + L2 + W2
. The surface area is given by A = 2HL + 2HW + 2LW. If the length of the interior diagonal is 15, and the surface area is 99, find the sum of H + W + L. 

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Problem by Mr. Twitchell

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