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Any parallelogram with congruent sides whose angles ##!=90?##

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Any parallelogram with congruent sides whose angles ##!=90?##.

A rhombus is a parallelogram in which all four sides are congruent (equal in length). A square is a parallelogram in which all four sides are congruent AND all four angles are right angles.

Squares are always rhombi, but not all rhombi are squares. The following is a picture of a rhombus, because all four of its sides are congruent BUT its angles are not right angles, so it is not a square.