Explain why a square must be a rectangle but a rectangle does not have to be a square

A rectangle is any four sided shape that has four right angles; Therefore, since a square is a four sided shape that has four right angles and congruent (equal) sides, it always has to be a rectangle. However a rectangle does not always have congruent sides, so it is not necessarily a square.

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

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