1. 11.1;
16. 4
17. 52
21. chord
22. tangent
23. diameter
24. radius
25. Point of tangency
26. Center of the circle
27. chord
28. radius
29. diameter
30. secant
31. tangent
32. secant
33. See board
34. See board
35. See board
40. (2,2); (6,2)
41. 2; 2
42. (4,2)

2. Goal: Use properties of a tangent to a circle.
11.2 Parts of Tangents
Goal: Use properties of a tangent to a circle.

3. Theorem 11.1
If a line is tangent to a circle, then it is perpendicular to the radius drawn at the point of tangency.

4. Theorem 11.2
In a plane, if a line is perpendicular to a radius of a circle at its endpoint on the circle, then the line is tangent to the circle.

5. 1. Use Properties of Tangents5

6. 2. Find the Radius of a Circle
12 feet

7. 3. Verify a Tangent to a Circle
Use the Converse of the Pythagorean to prove the triangle is a right triangle.

8. Theorem 11.3
If two segments from the same point outside a circle are tangent to the circle, then they are congruent.

9. 4. Find Leg Length 4

10. Find Leg Lengths 15 3

11. Homework
11.2 pg. 598
8-24 Even, 27