No, a rectangle cannot ever be a rhumbus - nor a rhombus (to give its correct selling).
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The definition I just now found online for a rectangle is:A quadrilateral with four right angles.To me, it seems that squares and rhombuses can fit that definition,if they want to, but don't necessarily have to.
A typographic error will make a rhombus into a rhumbus.
A rhumbus?
rhumbus
A square is always a rectangle. A rectangle is not always a square. And both are quadrilaterals.