Intro to Triangle Congruence

Lesson Prep

Lesson Details

• Duration: 50 minutes

• Learning Goal: Develop understanding of congruence by concluding that every point of each image can be matched up exactly with the other image.

Prework

• Bring 1-2 rolls of wax paper for students to trace the shapes in the Same Size, Same Shape? activity.

Answer Keys

• Link to Answer Keys

Classwork

• Estimation 180 – Day 133 (Andrew Stadel)

• Warm Up

• Same Size, Same Shape? (Illustrative Mathematics)

  • Handout

• Identifying Congruence Notation

  • Taken from New Visions

Standards

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