Quadrilateral

A geometric shape that has four sides (or edges) and four vertices (or corners).

The interior angles add up to 360°.

The interior angles add up to 360°.

Trapezoid

A quadrilateral that has exactly one pair of parallel sides

Parallelogram

A quadrilateral that has two pairs of parallel sides; opposite sides are parallel and opposite angles are congruent.

Rhombus

A special kind of parallelogram in which all sides are equal.

Rectangle

A special kind of parallelogram in which all angles are right angles.

Square

A special kind of parallelogram in which all sides are equal (equilateral) and all angles are equal (equiangular).