Area.
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the plane, or xy plane, has two dimensions space has 3 dimensions
Two dimensions of length: [L2]
1 metre is a linear measurement with one dimension. A square metre is a measurement of area and has two dimensions. The two are not interchangeable.
It either means "a measurable extent of some kind, such as length, breadth, depth, or height" or "a mode of linear extension of which there are three in space and two on a flat surface, which corresponds to one of a set of coordinates specifying the position of a point."
You need more dimensions. Square feet cannot convert to meters. One is an area measurement (two dimensions) and the other is linear (one dimension).