| A | B |
|---|
| circle | a closed, curved 2-dimensional figure having all points on the circle an equal distance from the center |
| chord | a line segment with endpoints on the circle |
| diameter | a chord that passes through the center of the circle |
| radius | a line segment that extends from the center of the circle to a point on the circle |
| central angle | an angle formed between 2 radii. Opposite central angles have the same measure. |
| center | a circle is named by its center; all points on a circle are the same distance from the center |
| adjacent | angles that are next to or adjoining one another |
| All points on a circle and opposite central angles | both have the same measure |
| 360 | number of degrees in a circle |
