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

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

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

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

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

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

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

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

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

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

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

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

13. Word
definition