Chapter 9 Section 3 (Arcs and Central Angles) Central Angle:

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ARCS AND CENTRAL ANGLES

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Presentation transcript:

Chapter 9 Section 3 (Arcs and Central Angles) Central Angle: Chapter 9 Section 3 (Arcs and Central Angles) B Central Angle: (vertex is the center of the circle) C Minor Arc: (less than half of a circle) E A F Major Arc: D (more than half of a circle) Semicircle: or Point A is the center of the circle. (half of a circle)

B If C Then And A D The measure of a semicircle is always 180°.

Ex #1: Find the measure of the identified angle of . Ex #1: Find the measure of the identified angle of . T 40° I 1 E A 225°

Ex #2: Find the measure of the identified angle of . Ex #2: Find the measure of the identified angle of . D E 1 30° A G

Ex #3: Find the measure of the identified angle of . Ex #3: Find the measure of the identified angle of . D B 130° A 1 E C

Ex #4: Find the measure of in . Ex #4: Find the measure of in . C 50° 60° B D A E

Ex #5: Find the measure of the arcs of . Ex #5: Find the measure of the arcs of . C 88° B 38° 2x 2x – 14 O 3x + 10 78° 3x D 4x A 52° 104° E

Chapter 9 Section 3 (Arcs and Central Angles) Homework: Chapter 9 Section 3 (Arcs and Central Angles) Homework: Section 9.3 Classroom Exercises (p. 341) #1-13 (all) Section 9.3 Written Exercises (p. 341–342) #1–11 (all) & 16 9.1 & 9.2 Practice worksheet