1. Write an example of each of the following: A.Radius ____ B.Secant ____ C.Tangent ____ D.Chord ____ E.Diameter ____ F.Minor arc ____ G.Major arc ____ H.Central angle ____ I.Inscribed angle ____ J.Center ____ Bell Ringer – Wednesday, December 2, 2015

2. Circles Quick Review of Definitions

3. Chord a segment whose endpoints lie on a circle A B AB

4. Arc an unbroken part of a circle

5. Minor Arc an arc that is less than half of a circle to name, use 2 points

6. Major Arc an arc that is more than half of a circle to name, use 3 points

7. Central Angle an angle whose vertex is at the center of a circle

8. Inscribed Angle an angle whose vertex is on a circle and whose sides are chords of the circle

9. Tangent a line, ray, or segment that is in the same plane as the circle, but intersects the circle in only one point

10. Secant a line, ray, or segment that contains a chord

11. Arc Length Arc Length is a portion of the circumference because everything is proportional when it comes to circles! You need to know the central angle that intercepts your arc to set up your proportion.

12. Examples Find the arc length: 1. Radius 5cm, central angle 50 o 2. Radius 7cm, central angle 100 o Find the circumference: 3. Central angle 55 o, arc length 5.5cm 4. Central angle 60 o, arc length 3.82m Find the central angle: 5. Arc length 45ft, radius 12ft 6. Arc length 30in, radius 14in

13. Assignments Classwork: Geometry book p. 686-688 #13-47 odd Homework: Circumference and Arc Length