| A | B |
|---|
| empty set | a set with no elements shown by the symbol { } |
| null set | a set with no elements shown by the symbol { } |
| center | the given point from which all points on the circle are the same distance |
| circle | the set of all points in a plane that are the same distance from a given point called the center |
| circumference | the distance around a circle |
| diameter | the distance across a circle through the center |
| pi | the ratio of the circumference of a circle to the diameter of a circle, approximately 3.14 or 22/7 |
| radius | the distance from the center of a circle to any point on the circle |
| gram | the basic unit of mass in the metric system |
| liter | the basic unit of capacity in the metric system |
| meter | the basic unit of length in the metric system |
| metric system | a system of measurement using the basic units |
