This is a Power Point lesson that introduces students to vocabulary associated with geometric constructions: construction, straightedge, compass, perpendicular lines, perpendicular bisector, and angle bisector. It also provides an illustrated and step-by-step scaffolded example of how the properties of an angle bisector can be used to solve a geometric problem algebraically. The file "Straightedge and Compass" constructions is a great follow-up to this lesson, as it provides guided practice opportunities for students.