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Quadrilateral
four-sided polygons
Trapezoid
Quadrilateral with exactly one pair of opposite sides parallel
Isosceles Trapezoid
Legs are congruent
Kite
Quadrilateral with two pairs of adjacent congruent sides
Trapezium
Quadrilateral with no parallel sides
Parallelogram
Quadrilateral where both pairs of opposite sides are parallel
Rhombus
Quadrilateral with 4 congruent sides
Rectangle
Quadrilateral with 4 right angles
Square
Quadrilateral with 4 right angles and 4 congruent sides