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None. A 1000x100 sq ft is a measure of area. Four such sides also represent a measure of area. It is not valid to convert from a measure of area to a linear measure such as a foot.
A quadrilateral has four sides with lengths, two diagonals with lengths, four inside angles, four outside angles, and an area. The angles are the only things you can measure with a protractor.
6 by 10 by 3 by 5 is not a measure of an area but of a four dimensional hypervolume.
A Square Inch is a measurement of 1" X 1" used to measure area. It is the area inside a square that (as all squares do) has four equal sides that each measure an inch. Its as simple as I can put it.
The surface area of the 'sphere' is four times the area of a 'great circle',or (4 pi) times the RADIUS squared.