| A | B |
|---|
| Polygon | A closed, straight edged figure with three or more sides, that does not cross itself. |
| Quadrilateral | A four-sided polygon |
| Concave Polygons | Polygons which appear to cave in upon themselves. If you place a stirng around the edges, it wouldn't touch all its sides. |
| Convex Polygons | Polygons in which a string will touch all sides when pulled tight around the figure. |
| Equilateral Polygon | A polygon with all sides congruent. |
| Equiangular Polygon | A polygon whose angles are all congruent. |
| Regular Polygon | A polygon with all sides and angles congruent. |
| Consecutive angles | Angles which are immediately beside each other. |
| Parallelogram | A quadrilateral with both sets of opposite sides parallel. |
| Trapezoid | A quadrilateral with exactly one set of parallel sides. |
| Rhombus | A parallelogram with four congruent sides. |
| Rectangle | A parallelogram with four right angles. |
| Square | A parellelogram with four right angles and four congruent sides. It is both a rhombus and a rectangle. |
| Bases of a trapezoid | The parallel sides of a trapezoid. |
| Midsegment of a Trapezoid | This special segment is half the sum of the bases. |
