Description
In Lesson 23, students study two proofs to demonstrate why the base angles of isosceles triangles are congruent. The first proof uses transformations, while the second uses the recently acquired understanding of the SAS triangle congruency. The demonstration of both proofs highlight the utility of the SAS criteria. Encourage students to articulate why the SAS criteria is so useful.
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From EngageNY.org of the New York State Education Department. Geometry Module 1, Topic D, Lesson 23.
Available from engageny.org/resource/geometry-module-1-topic-d-lesson-23; accessed 2015-05-29.
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