1. Warm Up 3-7 Write the standard form equation of the circle

2. Announcements Test Friday Online Homework due Wednesday night Warm ups due Thursday

3. Tangent Lines A tangent to a circle is a line in the plane of the circle that intersects the circle in exactly one point. The point where a circle and a tangent intersect is the point of tangency.

4. Theorem 12-1

5. Theorem 12-2 If a line in the plane of a circle is perpendicular to a radius at its endpoint on the circle, then the line is tangent to the circle.

6. Theorem 12-3 If two tangent segments to a circle share a common endpoint outside the circle, then the two segments are congruent.

7. Example 1 What is the radius of the circle?

8. Example 2 IS ML tangent to circle N?

9. Example 3 Circle A is inscribed in the quadrilateral, what is the perimeter?

10. Classwork –Pg. 490 #1-3, 7-11