| A | B |
|---|
| circumference | the distance around a circle |
| diameter | the distance from a straight line passing from side to side through the center of a circle or sphere. |
| radius | the distance from the centerpoint of a circle to any point on the curve |
| chord | a line segment with both endpoints on the curve |
| arc | the curve of a curcle |
| circle | a set of all points in a plane that are equidistant from a fixed point called the center |
| tangent | a line that intersects a circle in exactly 1 point |
| concentric circles | circles that have the same centerpoint but never intersect |
| intersecting circles | 2 or more circles that intersect at 2 points |
| secant | a line that passes through a circle at exactly 2 points |
