Description
Students add the law of cosines to their repertoire of tools that analyze the measurements of triangles. To prove the law of cosines, students build squares on the sides of an oblique triangle and then analyze their areas.
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From EngageNY.org of the New York State Education Department. Precalculus and Advanced Topics Module 4, Topic B, Lesson 9.
Available from engageny.org/resource/precalculus-and-advanced-topics-module-4-topic-b-lesson-9; accessed 2015-05-29.
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