it has one dimention.
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You can't have cubic feet in an area. Area is for two dimentions and volume is for 3 dimentions.20ft by 20ft is 400ft2
The dimensions (not dimentions) may be called length, breadth (or width) and height (or depth).
Just the two of them at each end of the line segment.
two
It is simply a length of 60 inches.