| A | B |
|---|
| distance from the center to a point on the circle | radius |
| a chord that contains the center of the circle | diameter |
| a segment whose endpoints are on the circle | chord |
| a line that intersects the circe in exactly one point | tangent |
| a line that intersects the circle in exactly two points | secant |
| the arc of the circle on the interior of a central angle | minorarc |
| an arc that is half a circle | semicircle |
| the part of the circle on the exterior of the central angle | majorarc |
| an angle whose vertex is the center of the circle | centralangle |
| an angle whose vertex is on the circle | inscribedangle |
