| A | B |
|---|
| perimeter | the distance around a shape |
| area | the number of square units that fit inside the perimeter of a polygon |
| circumference | the perimeter of a circle |
| concave | a polygon whose shape turns in on itself (caves in) |
| diameter | the distance across the middle of a circle |
| equilateral | having equal sides |
| hexagon | a 6 -sided polygon |
| octagon | an 8-sided polygon |
| pi | 3.14 |
| polygon | an enclosed, many sided figure |
| radius | half the distance across a circle (half the diameter) |
| ratio | a relationship between two measurements |
| trapezoid | a 4-sided polygon in which two sides are parallel |
| triangle | a 3-sided polygon |
