4 Written Questions
4 Multiple Choice Questions
 ...then the parallelogram is a rectangle.
 A quadrilateral with four congruent sides.
 A quadrilateral with four congruent sides and four right angles.
 A proof by contradiction. A proof in which the statement you want to prove is assumed to be false.
3 True/False Questions

rectangle → A quadrilateral with four right angles.

If the diagonals of a parallelogram are perpendicular... → ...then the parallelogram is a rhombus.

parallelogram → A quadrilateral with two pairs of parallel, congruent sides.