1. Circles

2. Circle  Is the set of all points in a plane that are equal distance from the center. This circle is called Circle P. P

3. Terms Involving Circles  Radius – A segment from the center to a point on the edge of the circle. Radius

4. More Terms  Diameter – Is a line segment containing the center point with the line segments end points on the circle. Diameter Center of the Circle

5. Just a few more...  Chord – Is a line segment that joins two points on a circle.  Tangent – Is a line that lies in the plane of the circle and meets the circle in exactly one point, called the point of contact, which is point T above.  Secant – Is a line that passes through a circle at two points. A B X Y T

6. Other Parts of Circles  Arc is a part of a circle. There are three types of arcs.  Semicircle arc ABC  Minor arc BC  Major arc CAB B C A M

7. Yes, More Parts... Inscribed Angles – created when two chords have a common endpoint. Central Angle – created when two radii meet at the center point Intercepted Arcs – the arc created between the two endpoints of an inscribed angle.

8. Calculations with Circles Circumference & Area