You can use GeoGebra to construct the perpendicular bisector to a line segment. GeoGebra Instruction 1 1. Open Graphics View under View in Menu. 2. Click on Perpendicular Bisector by first clicking tool number 4, then tool number 3 in the drop-down list. 3. Click on the first end-point of a line segment. 4. Click on the second end-point of the line segment.