Lesson: Congruence of Triangles: ASA and AAS Mathematics

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In this lesson, we will learn how to prove that two triangles are congruent using either the angle-side-angle (ASA) or the angle-angle-side (AAS) criterion and determine whether angle-side-side is a valid criterion for triangle congruence or not.

Lesson Plan

Students will be able to

recognize whether two given triangles are congruent,
recognize that ASA and AAS are conditions of congruency but that SSA is not,
recognize whether ASA or AAS can be used to prove that two given triangles are congruent,
solve a word problem or a more complex geometric problem using ASA or AAS.