A quadrilateral with both pairs of opposite sides parallel
Parallelogram
A parallelogram with four congruent sides
Rhombus
A parallelogram with four right angles
Rectangle
A parallelogram with four congruent sides and four right angles
Square
A quadrilateral with exactly one pair of parallel sides
Trapezoid
A trapezoid whose nonparallel opposite sides are congruent
Isosceles trapezoid
A quadrilateral with two pairs of adjacent sides congruent and no opposite sides congruent
Kite