Description
In Lesson 21, students consolidate their understanding of congruence in terms of rigid motions with knowledge of corresponding vertices and sides of triangles. They identify specific sides and angles in the pre-image of a triangle that map onto specific angles and sides of the image. If a rigid motion results in every side and every angle of the pre-image mapping onto every corresponding side and angle of the image, they assert that the triangles are congruent.
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From EngageNY.org of the New York State Education Department. Geometry Module 1, Topic C, Lesson 21.
Available from engageny.org/resource/geometry-module-1-topic-c-lesson-21; accessed 2015-05-29.
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