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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Trigonometric Ratios and the Pythagorean Theorem

For Teachers 9th - 10th Standards
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...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Finding Trig Values

For Teachers 9th - 10th
For this task, students are give values for sin, cos, or tan, and use them to find the missing value as well as the quadrant of the angle. Aligns with HSF-TF.C.8.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Calculations With Sine and Cosine

For Teachers 9th - 10th Standards
The goal of this task is to study some values of sin x and cos x for different angles, and to look for and then explain patterns that are seen. Aligns with HSF-TF.C.8.
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Unknown Type
Khan Academy

Khan Academy: Algebra Ii: Use the Pythagorean Identity

For Students 9th - 10th Standards
Given the sine (or cosine) of an angle, find its cosine (or sine) using the Pythagorean identity. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.