##
5.4#39
**Original:** A square is a rhombus with a right angle.
**Conditional:** If a rhombus has a right angle, then it is a square.

5.4#40
**Original:** A square is rectangle with two adjacent sides congruent.
**Conditional:** If a rectangle has two adjacent sides congruent, then it is a square.

5.4#41
**Original:** A square is a rhombus with congruent diagonals.
**Conditional:** If a rhombus has congruent diagonals, then it is a square.

5.4#42
**Original:** A square is a rectangle with perpendicular diagonals.
**Conditional:** If a rectangle has perpendicular diagonals, then it is a square.

5.4#43
**Original:** A parallelogram with one right angle is a rectangle.
**Conditional:** If a parallelogram has one right angle, then it is a rectangle.