| A | B |
|---|
| circle | all points equidistant from a center pointf |
| perpendicular | two lines that intersect at 90 degree angles |
| parallel | lines on the same plane that never intersect |
| circumference | distance around a circle |
| pi | approximately 3.14 |
| radius | distance from the center to the circle |
| sector | pie shaped part of a circle |
| chord | any line connecting two points on a circle |
| angle | two rays with a common endpoint |
| diameter | distance across a circle through the center |
