Section 10 – 2 Find Arc Measures. Vocabulary Central Angle – An angle whose vertex is the center of the circle. Minor Arc – An arc whose measurement is.

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Presentation transcript:

Section 10 – 2 Find Arc Measures

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

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

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!

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.

Example 1

Example 2

Example 3

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