1. Module 19: Lesson 5 Angle Relationships in Circles
Intersecting Chords Angle Measure Theorem
If 2 chords intersect inside a circle, then the measure of each angle formed is half the sum of the measures of its intercepted arcs. B A 1 2 E
See Your Turn #4 & #5 page 1057 D

2. Tangent-Secant Interior Angle Measure Theorem
If a tangent and a secant (or chord) intersect on a circle at the point of tangency, the measure of the angle formed is half the measure of its intercepted arc. C B E A
See example 2 page 1058

3. Tangent-Secant Exterior AngleMeasure Theorem
If a tangent and a secant, 2 tangents, or 2 secants intersect in the exterior of a circle, then the measure of the angle formed is half the difference of the measures of its intercepted arcs. A
See #8 page 1059 B C D

4. A
See Example 3B page 1059 B C D

5. See Example 3A page 1059 A D B E C

6. Homework pages 1062-1067 #’s 3-16 (all), 19, 20