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4 Written questions
4 Multiple choice questions
 ...then the quadrilateral is a parallelogram.
 ...then the parallelogram is a rectangle.
 A quadrilateral with two pairs of parallel, congruent sides.
 a) Propose a new conditional by negating the original conclusion. b) Show the absurdity of the new conditional.
3 True/False questions

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

indirect proof → A proof by contradiction. A proof in which the statement you want to prove is assumed to be false.

square → A quadrilateral with four congruent sides and four right angles.