1. 10-6: Secants, Tangents, and Angle Measures

2. Secant – a line that intersects a circle at two points.

3. Intersections inside a circle (angles):
When two lines intersect inside a circle, the angles are an average of the opposite arcs.
m<1= ½ (mCD+mAB)

4. Find the measure of numbered angle if mKL=47° and mNM=88°.

5. Intersections on circle:
If a tangent and a secant intersect at the point of tangency. The angle formed is ½ of the intercepted arc.

6. Intersections outside circles (angles):
X= ½ (big arc – small arc)

7. Find each missing variable

8. Find m<A

9. Assignment:
p. 564; 12-33all