Lesson Plan

Illustrative Mathematics: F Tf Trigonometric Ratios and the Pythagorean Theorem

Curated by ACT

The purpose of this task is to use the Pythagorean Theorem to establish a fundamental trigonometric identity for an acute angle. The reasoning behind this identity is then applied to calculate a cosine for a given obtuse angle. Aligns with F-TF.C.8.

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CCSS: Adaptable
Common Core