The simplest closed three-sided geometric figure. Triangle The simplest closed three-sided geometric figure.

A polygon that has four sides. Quadrilateral A polygon that has four sides.

Sides that do not share a common endpoint. Opposite Sides Sides that do not share a common endpoint.

Sides that do share a common endpoint. Consecutive Sides Sides that do share a common endpoint.

A quadrilateral with all sides congruent and all angles congruent. Square A quadrilateral with all sides congruent and all angles congruent.

Rectangle A quadrilateral with opposite sides congruent and all angles congruent.

A quadrilateral with all sides congruent. Rhombus A quadrilateral with all sides congruent.

A quadrilateral in which both pairs of opposite sides are parallel. Parallelogram A quadrilateral in which both pairs of opposite sides are parallel.

Kite A quadrilateral with two pairs of consecutive congruent sides and opposite sides that are not congruent.

A quadrilateral with exactly one pair of parallel sides. Trapezoid A quadrilateral with exactly one pair of parallel sides.

Polygon A closed figure that is formed by joining three of more line segments and their endpoints.

Irregular Polygon A polygon whose sides are not the same length and wholes angles are not the same measure.

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