1. Lesson 10-6: Secants and Tangents and Angle Measures
Mrs. Mongold
Geometry CP

2. Secant and Tangent Two Secants: Two Secants Two Tangents
Interior angle = ½ intercepted arc
Two Secants:
Interior angle = ½ (sum of intercepted arcs)
Two Secants
Exterior angle = ½ (far arc – close arc)
Two Tangents

3. 2 Secants/chords:
Angle 1 = ½ (arc AD + arc CB)
Angle 2 = ½ (arc AC + arc DB) B 2 1 A D

4. Secant ED intersects tangent FC at a point of tangency (point F)
Angle 1 = ½ arc FE
Angle 2 = arc EA – arc FB 1 F B A 2 C