Triangle Congruence Proofs

Lesson Prep

Lesson Details

• Duration: 50 minutes

• Learning Goal: Develop understanding and fluency with triangle congruence proofs.

Answer Keys

• Link to Answer Keys

Classwork

• Estimation – 2 Triangles

• Warm Up

• Why SAS Works

• Notes

• Spiraling Practice

Standards

Common Core

• HSG.CO.B.8 – Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.

• HSG.SRT.B.5 – Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

TEKS

• G.6(B) – prove two triangles are congruent by applying the Side-Angle-Side, Angle-Side-Angle, Side-Side-Side, Angle-Angle-Side, and Hypotenuse-Leg congruence conditions