1. Lines that Intersect Circles
2017

2. New Vocab Chord: a segment whose endpoints lie on a circle
Secant: a line that intersects a circle at two points
Tangent: a line that intersects a circle at exactly one point
Point of Tangency: the point where the tangent and a circle intersect

3. Point of Tangency

4. Types of Circles Congruent Circles: circles that have congruent radii
Concentric Circles: coplanar circles with the same center
Tangent Circles: two circles that intersect at exactly one point

5. Example 1: Identify each line or segment that intersects the circle

6. Tangent Lines Theorem
If two segments are tangent to a circle from the same external point, the segments are congruent.

7. Example 2: Find each length
a. x b. RS

8. Another Tangent Line Theorem
If a line is tangent to a circle, then it is perpendicular to the radius.

9. Homework
9-12, 16-22, 26, 27, 32, 37