# 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 =

H

. 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. ^{2}+ L^{2}+ W^{2}Presentation mode

Problem by Mr. Twitchell

## Solution

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