Answer:
20) Rhombus | 21) Rhombus | 22) Square
Explanation:
20) All sides are congruent, but there is no right <'s, and therefore it is just a Rhombus.
21) A Rhombus has diagonals that bisect each other and are congruent, which is shown in 21.
22) A square is a shape with all sides congruent and at least 1 right angle, which the diagram meets.
Hopefully this helps!