A square, by definition, must have four right angles.
A plane shape with 4 right angles which is not a square is a rectangle.
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square
A rhombus looks like a lopsided square, or a diamond shape. It is a parallelogram with four equal sides. The angles of a rhombus do not all need to be equal BUT opposite angles of a rhombus ARE equal. If you were to "straighten it up" and make all the angles equal at right angles, it would be a square. A rhombus with four right angles is a square.
a square...
it could be a square or a rectangle. its a square if all four sides are congruent, but if not, its a rectangle.