1. Circle Unit Notes
AA1 CC

2. Circle
The set of all points in a plane that are equidistant from a given point called the CENTER of the circle.
A circle is named
by its center. K

3. A segment whose endpoints are the center and any point on the circle
Radius
A segment whose endpoints are the center and any point on the circle

4. A segment whose endpoints are on a circle.
Chord
A segment whose endpoints are on a circle.

5. A chord that contains the center of the circle.
Diameter
A chord that contains the center of the circle.

6. A line that intersects a circle in two points.
Secant
A line that intersects a circle in two points.

7. Tangent
A line in the plane of a circle that intersects the circle in exactly one point, the point of tangency.

8. Summary

9. An angle whose vertex is the center of the circle.
Central Angle
An angle whose vertex is the center of the circle.

10. Inscribed Angle
An angle whose vertex is on a circle and whose sides contain chords of the circle

11. An arc with endpoints that are the endpoints of a diameter
Semicircle
An arc with endpoints that are the endpoints of a diameter
(1/2 a circle)

12. A part of its circumference.
Arc
A part of its circumference.

13. Types of Arcs Minor Arc- An arc that is less than 180 degrees.
Major Arc- An arc that is greater than180 degrees

14. A sector is the part of a circle between two radii and an arc.

15. TIME TO PRACTICE! Circle Theorems…