Types of quadrilaterals

Answer 1

Parallelogram -- 2 pairs of parallel sides

Trapezoid -- exactly 1 pair of parallel sides

Rhombus -- 4 congruent sides

Rectangle -- 4 angles congruent

Square -- four angles and sides congruent

Answer 2

Any polygon with four sides is a quadrilateral. Some more specific example of quadrilaterals are: parallelogram > rectangle > square parallelogram > rhombus > square trapezoid > isosceles trapezoid where ">" indicates that the one is a special case of the other.