The statement ' a square is a rhombus but a rhombus is not a square' is justified. This is because the definition of a square is that all opposite sides are parallel, all sides are equal and adjacent sides are perpendicular. However, the definition of a rhombus is that all opposite sides are parallel and all sides are equal. Adjacent sides need not be parallel. So, a square is a rhombus, but a rhombus is not a square.
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