This figure should help as you work through the construction process:

**Open your compass to any radius***r*that's more than half the length of segment*CD,*and construct arc (*C*,*r*).**Construct arc (***D*,*r*) intersecting arc (*C*,*r*) at points*G*and*H.***Draw line**You're done: line*GH*.*GH*is the perpendicular bisector of segment*CD*.