Rectangles are squares too, but not all squares are rectangles. When all four sides of a rectangle are not congruent, that is, when all four sides are not the same length, then a rectangle is NOT a square. Instead, a rectangle will have two pairs of sides, with each pair having two sides that are opposite each other, parallel to each other, and congruent to each other while, at the same time, NOT congruent to the other.
In conclusion, a rectangle is not a square if all four of its sides are not congruent, or if all four of its sides do not match.
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