The Eüler line connects altitude, median, and perpendicular bisector constructions in triangles and incorporates algebraic and geometric proofs. This presentation will discuss a unit for discovering the centers of triangles using compass, Mira, and Sketchpad, as well as misconceptions, extensions, and the unit's use in preservice teaching courses.

Presentation Format: Preservice and In-Service Session
Grade Band Audience: Preservice and Inservice, 9 to 12