| A | B |
|---|
| Distance around a circle | circumference |
| Every point on a circle is the same distance from its | center |
| Distance across a circl through its center | diameter |
| Distance from a circle to its center | radius |
| Two or more circles with the same center | concentric circles |
| segmnt between two points on a circle | chord |
| Part of a circumference | arc |
| Part of a circle bounded by an arc and two radii | sector |
| Half a circle | semicircle |
| Angle whose vertex is the center of a circle | central angle |
| Angle whose vertex is on the circle whose sides include chords | inscribed angle |
| A polygon whose vertices are on the circle and whose edges are within the circle | inscribed polygon |
