| Term | Definition |
|---|
| Quadrilateral | A polygon with 4 sides |
| Parallelogram | a quadrilateral whose opposite sides are both parallel and equal in length (congruent) |
| Rectangle | a parallelogram with opposite sides congruent and 4 right angles |
| Square | a rectangle having all sides congruent |
| Rhombus | a parallelogram with all sides congruent |
| Trapezoid | a quadrilateral having only one pair of parallel sides, called bases |
| Polygon | a closed plane figure formed by line segments |
| Regular polygon | a polygon with all sides congruent and all angles congruent |
| Diagonal | a line segment that connects two vertices of a polygon and is not a side. |
| Concave | curved inward, creating a hollow space |
| Convex | curved or bulged outward |
| Pentagon | a 5 sided polygon |
| Hexagon | a 6 sided polygon |
| Heptagon | a 7 sided polygon |
| Octagon | an 8 sided polygon |
| Nonagon | a 9 sided polygon |
| Decagon | a 10 sided polygon |
| Dodecagon | a 12 sided polygon |
| Polyhedron | a three dimensional figure with flat surfaces that are polygons |
| Pyramid | a polyhedron with a polygon base and triangular sides that all meet at a common vertex; named for its base |
| Prism | a polyhedron named for its 2 congruent and parallel bases. All other faces are parallelograms. |
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