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No, not every quadrilateral with four congruent sides is a square. A rhombus also has four congruent sides, but it's four angles do not equal ninety degrees, as do the angles in a square. However, in a rhombus the opposite angles are equal and add up to 360 degrees, just like a square.
Yes. A rhombus is a "squashed" square in that every side is equal in length but only opposite angles are equal. The square is a special case of a rhombus where not only are opposite angles equal, but all 4 angles are equal. All squares are rhombuses but not all rhombuses are squares.
Yes
Yes
if all four angles are 90 degreesthen it is a square. it is not even refered to as a rhombus