Lesson 22 begins to investigate criteria, or the indicators, of triangle congruence. Students are introduced to the concept in Grade 8 but justified the criteria of triangle congruence (i.e., ASA, SAS, and SSS) in a more hands-on manner, manipulating physical forms of triangles through rigid motions to determine whether or not a pair of triangles is congruent. In this lesson, students formally prove the triangle congruency criteria.
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From EngageNY.org of the New York State Education Department. Geometry Module 1, Topic D, Lesson 22.
Available from engageny.org/resource/geometry-module-1-topic-d-lesson-22; accessed 2015-05-29.
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