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Squares have four equal sides and equal angles, rectangles only have two.
a2 - b2 = (a + b)(a - b).
It is the difference of two squares which is: (6-10w)(6+10w)
Squares of prime numbers, among others.
a^2 - b^2 = (a - b)(a + b) a^2 + b^2 doesn't factor rationally.