Geometry Unit 10

1. The point where a tangent line touches a circle.
3. A line that intersects a circle at exactly one point.
5. An equation written as: ________________________ where the center and radius must be found by completing the square.
6. An angle whose vertex is on the circle and whose sides contain chords.
8. A quadrilateral whose four vertices lie on a circle.
10. An equation that shows the center and radius directly: __________________ where (h,k) is the center and r is the radius.
13. Chords in the same or congruent circles that have equal lengths.
14. Half of a circle; an arc measuring 180°.
17. A segment that passes through the center of a circle with endpoints on the circle.
19. A segment from the center of a circle to a point on the circle.

2. Arcs in the same or congruent circles that have equal measures.
4. An angle whose vertex is the center of the circle.
7. A line that intersects a circle at two points.
9. The longer arc between two points on a circle (greater than 180°).
11. The shorter arc between two points on a circle (less than 180°).
12. The distance along the curved portion of a circle between two points.
15. A segment with both endpoints on a circle.
16. The fixed point inside a circle from which all points on the circle are equidistant.
18. The set of all points in a plane that are the same distance from a fixed point.
20. The measure, in degrees, of the central angle that intercepts an arc.