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.