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If you double the cross-sectional area and halve the length, you will still have the same volume but the dimensions will be different.
Basically, if you check the dimensions of an equation and get different dimensions on the left and on the right, the equation is definitely wrong. If you get the same dimensions, it MAY be right.
The Cartesian coordinate system can be used in 3 or more dimensions.
If I only know the area, I can't tell you the dimensions. It all depends on the shape. A circle and a square give two different answers, and there are millions of rectangles, with different dimensions, that are all perfectly good and completely correct answers.
Space can be divided into n different dimensions. Every dimension is orthogonal to rest all the dimensions. That is the dot product of x with y is zero (y not equal to x).