We start with a given circle.


1. Using a straightedge, draw any two
chords of the circle. For greatest accuracy, avoid chords that are
nearly parallel. 

2. Construct the perpendicular bisector of one of the chords using the method described in
Constructing a perpendicular bisector of a line segment 

3. Repeat for the other chord 

4. The point where the two lines intersect is the center C of the circle. 
