| A | B |
|---|
| kilometer (km) | A metric unit of length equal to 1,000 meters. |
| meter (m) | A metric unit of length equal to 100 centimeters. |
| centimeter (cm) | A metric unit of length. 100 centimeters equal 1 meter. |
| millimeter (mm) | A metric unit of length. 1,000 millimeters equal 1 meter. |
| hectometer (hm) | Metric unit of length equal to 100 meters.. |
| dekameter (dam) | A metric unit of length equal to 10 meters. |
| decimeter (dm) | A metric unit of length. 10 decimeters equal 1 meter. |
| perimeter | The distance around the outside of any polygon. |
| formula | An equation that states a rule. |
| circumference | The distance around a circle. |
| diameter | Any line segment through the center that connects two points on the circle. |
| pi | The ratio of the circumference of a circle to its diameter. The decimal for pi is 3.141592... As approximations for pi, 3.14 and 3 1/7 are often used. |
| radius | Any line segment that connects the center of a circle to a point on the circle. |
| area | The number of square units needed to cover a surface or figure. |
| base | The side of a polygon to which the height is perpendicular. |
| height | The length of a segment from one vertex of a polygon perpendicular to the base. |
| elapsed time | The difference between two times. |
| Fahrenheit | Unit of temperature measurement for the customary system. |
| Celsius | Unit of temperature measurement for the metric system. |
