Question 902637
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Hi,
*[illustration rectangular_solid.png].
Surface = 2lw + 2lh + 2wh
Surface = 2(3h)4 + 2(3h)h + 2*4h = 88cm^2
 6h^2 + 24h + 8h -88 = 0
6h^2 + 32h - 88 = 0
 3h^2 + 16h - 44 = 0 (Tossing out the negative solution for unit measure)
h = 2cm
l = 6cm
w = 4cm
Surface = 2lw + 2lh + 2wh = 48 + 24 + 16 = 88
 *[invoke quadratic "x", 3,16,-44]