U1L3 Construction Techniques 1: Perpendicular Bisectors

The purpose of this lesson is to lay the foundation for understanding the perpendicular bisector of a segment as both a line perpendicular to a segment passing through its midpoint (by definition) and the set of points equidistant to the endpoints. The second fact will be proven in the next unit. The perpendicular bisector plays a key role in the definition of reflection later in this unit and in the proof of the Side-Side-Side triangle congruence theorem in the next unit. This activity includes lesson summary videos and practice problems.

By JOEL NELSON