1. 12.1 Tangent Lines
By Brit Caswell

2. A little bit of vocab…
A tangent to a circle is a line that intersects the circle at exactly one point.
The point where the tangent and the circle intersect is called the point of tangency

3. Theorem 12-1
If a line is tangent to a circle, then the line is perpendicular to the radius at the point of tangency.

4. Pg 763, #1
Find the value of x.

5. Pg 763, Got it?
Find the value of x.

6. Theorem 12-2
If a line is perpendicular to a radius at the end point that is on the circle, then the line is tangent to that circle.

7. Pg 765, #3
Find the value of x.

8. Pg 765, #4

10. Pg 766, #5
Find the perimeter of the triangle.