Rigid Motions & Congruence

50 Minute Class, Curriculum, Geometry

Learning Goal: Develop understanding of congruence by connecting it with rigid transformations.

Credit Note

Pretty much this whole lesson was taken from Marisa Laks. A big thank you goes to Lisa Bejarano as well for putting the lesson on her Geometry Planning Guide.




  • Common Core
    • HSG.CO.B – Understand congruence in terms of rigid motions
  • TEKS
    • G.5(A) – investigate patterns to make conjectures about geometric relationships, including angles formed by parallel lines cut by a transversal, criteria required for triangle congruence, special segments of triangles, diagonals of quadrilaterals, interior and exterior angles of polygons, and special segments and angles of circles choosing from a variety of tools
    • G.6(C) – apply the definition of congruence, in terms of rigid transformations, to identify congruent figures and their corresponding sides and angles