| A | B |
|---|
| Polygon | A simple closed figure in a plane formed by three or more line segments. |
| side | The line segment connecting two adjacent sides of a polygon. |
| triangle | A polygon with three sides. |
| Quadrilateral | A polygon with 4 sides. |
| Pentagon | A polygon with 5 sides |
| Octagon | A polygon with 8 sides. |
| Perimete of a polygon | The sum of the sides of a polygon |
| Area of a polygon | The number of square units needed to cover a surface enclosed by a geometric figure. |
| rectangle | A quadrialtera with all equal angles |
| length | the longest side of a rectangle |
| width | The shorter side of a rectangle |
| Parallelogram | A quadrilateral with the opposite sides parallel |
| height of a parallelogram/trapezoid | The perpendicular distance between the bases. |
| vertex | The point between two sides. |
| Height of a triangle | The perpendicular distance between a vertex and the base |
| Trapezoid | A quadrilateral with exactly one pair of parallel sides. |
| Base of trapezoid | The parallel sides. |
| Regular Polygon | A polygon with all equal sides and angles. |
| Apothem | The distance from the center of regular polygon to the side. |
| diameter | The distace across a circle through the center |
| circumference | The distance around a circle. |
| radius | The distance from the center of a circle to its side. |
| Composite Figure | A shape composed of two of more figures. |
