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Mathematics LibreTexts

2.A: Proving Triangle Congruence

  • Page ID
    31441
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    Overview

    The purpose of this lesson is to identify when we can claim two triangles are congruent.

    This lesson will address the following CCRS Standard(s) for Geometry:

    • 8.G.2: Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them
    • G.SRT.5: Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures

    Directions

    1. Take notes while watching videos below
    2. Go to http://wamap.org and log into our course to complete assignment 2.A with 80% or better.

    Do

    Complete assignment 2.A with 80% or better at http://wamap.org

    Summary

    In this lesson we have learned:

    • To identify congruent triangles we need to know three parts are congruent: SSS, SAS, ASA, or AAS
    • The following combinations do not necessarily indicate congruence: ASS and AAA
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