1. [10.2] Perpendicular Bisector  Draw a Chord AB  Find the Midpoint of AB (Label it M)  From M, draw a line through O  What do you notice? Circle #1

2. Circle #2  Draw a Chord AB  Draw a perpendicular line from O to AB  Label this point C  What do you notice?  Measure AC, BC

3. Circle #3  Draw a Chord AB  Find the Midpoint of AB (Label it M)  Starting at M, Draw a perpendicular line  What do you notice?

4. Perpendicular Bisector Theorem  The 3 important features are: 1. 2. 3.  If you have Then:

5. p389 #4  CD bisects chord AB.  The Radius is 15cm  AB = 24cm  What is the length of CE?