Hmmm. Imagine you have a pair of foot-long die (or a pair of dice, it doesn't matter). Thelengthof the edge of the die is 1 foot, you would write that as " "

Now look at asideof the die, it is a square with edges of 1 ft. Theareaof the side is , or 1 square foot.

Now look at the entire die. It is a cube with edges of 1ft. Thevolumeof that cube is or "one cubic foot"

So foot is 1-dimensional

feet squared is 2-dimensional

and feet cubed is 3-dimensional