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Squares have four equal sides and equal angles, rectangles only have two.
Parallelograms Rhombuses Rectangles Squares
Rectangles have four right angles so, yes, all squares are rectangles because they also have four right-angled corners. However, rectangles can have sides of any length, as long as the opposite sides are of equal length, whereas a square has all four sides of equal length. A more technical reply could be that a rectangle has two pairs of congruent and parallel sides, which all squares have.
A box made of four identical rectangles for the front/top/back/bottom and the end pieces are squares.
rectangles, squares