As for example: x^2-9 = (x-3)(x+3) when factored is the difference of two squares
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A square has four right angles, a rhombus doesn't.
I don't know if there's a specific name for these two shapes, but the only two shapes that have 4 equal sides are the square and rhombus. The difference between the two is the square has 4 equal angles (90 degrees) and a rhombus does not.
A square is well a square while a rhombus is a square on one of the corners (a square diamond)
The approx difference is 0.7
6 and 7. They are (13-1)/2 and (13+1)/2