| A | B |
|---|
| Radius | line segment starting at the center of the circle and extending to the edge of the circle |
| chord | line segment connecting two points on the edge of the circle |
| diameter | a chord passing through the center of the circle |
| minor arc | an arc of the circle less than 180 degrees |
| major arc | an arc of the circle 180 degrees or more |
| tangent | a line that intersects a circle in exactly one point |
| secant | a line that intersects a circle in exactly two points |
| circumference | the distance around a circle |
| arc length | the length of a portion of the circle (in other words, a portion of the circumference) |
| center | the point from which a circle is named |
