A square and a rhombus
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A square is a four-sided polygon with two congruent parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
a rhombus has four sides that are congruent
All figures with four congruent sides are rhombuses. All figures with four congruent angles are rectangles. Any shape that is both a rhombus and a rectangle is a square.
A diamond is actually an informal term for a rhombus, which has four equal sides(congruent is not used to refer to equal sides), with the opposite sides being parallel to one another.So a "diamond" has four equal sides and two pairs of parallel sides.