1. Section 10 – 2 Find Arc Measures

2. Vocabulary Central Angle – An angle whose vertex is the center of the circle. Minor Arc – An arc whose measurement is less than 180°. Major Arc – An arc whose measurement is greater than 180°. is a central angle of

3. Vocabulary Semicircle – An arc with endpoints of a diameter and whose measurement is 180°. is a semicircle.

4. Vocabulary Measure of Whole Circle is: 360° Measure of Semicircle is: 180° Measure of Minor Arc is the measure of the CENTRAL ANGLE! Measure of Major Arc is the difference between 360° and the CENTRAL ANGLE!

5. Arc Addition Postulate (Post 23) The measure of an arc formed by two adjacent arcs is the sum of the measures of the two arcs.

6. Example 1

7. Example 2

8. Example 3

9. Homework Section 10-2 Page 661 – 663 1, 3 – 14, 17, 22 – 24, 29 – 34