Question 20
The quadrilateral is a rhombus because there are four congruent sides. The quadrilateral cannot be more specifically classified as a square because one of the interior angles is not a right angle.
Question 21
The quadrilateral is a parallelogram because the diagonals bisect each other.
Question 22
The quadrilateral is a square because it is a rhombus (four congruent sides) with a right angle.