Question 310949
"Cubic feet of octagon?  Dimensions 46 1/4 x 38 x 1/4 x 40"?

I know cube of a square is LXWXH \ 1728, but octagon has 4 sides."

Cubic feet of a octagon? octagons are 2-dimensional figures, you could calculate area but not volume.
Octagons have 8 sides, not 4.