Students draw parallelograms to clarify their attributes, and define parallelograms based on those attributes. Students see, for example, that the same process they used to construct a parallelogram also produces a rectangle when all angles are constructed to measure 90°.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 5, Topic D, Lesson 17.
Available from engageny.org/resource/grade-5-mathematics-module-5-topic-d-lesson-17; accessed 2015-05-29.
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