Find Trigonometric Values for Angles Using Reference Triangles

This Find Trigonometric Values for Angles Using Reference Triangles video also includes:

Put the triangle back in trigonometry, and show learners how the unit circle is built up of right triangles. Taking the skills they know from the first quadrant, the class discovers that these values repeat in all of the quadrants by using the sine and cosine of the reference triangle. 

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CCSS: Designed
Instructional Ideas

  • Use the other videos in the series for more practice with sine and cosine on the unit circle
Classroom Considerations

  • The link will prompt you to sign up for a free account in order to view the video
Pros

  • Begins with a good review on the trigonometric functions and triangles
Cons

  • When referring to quadrant III as being negative, they don't label the sine and cosine as negative
Common Core