| A | B |
| apothem | A segment that is drawn from the center of a regular polygon perpendicular to a side of the polygon. |
| irregular figure | A figure that cannot be classified as a single polygon. |
| geometric probability | Using the principles of length and area to find the probability of an event. |
| sector | A region of a circle bounded by a central angle and its intercepted arc. |
| segment | The region of a circle bounded by an arc and a chord. |
| irregular polygon | A polygon that is not regular. |
| penta- | prefix meaning 5 |
| dec- | prefix meaing 10 |
| oct- | prefix meaning 8 |
| hept- | prefix meaning 7 |
| hex- | prefix meaning 6 |
| quad- | prefix meaning 4 |
| tri- | prefix meaning 3 |
| bi- | prefix meaning 2 |