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Instructional Video

Introduction to the Unit Circle, Trigonometry

Curated and Reviewed by Lesson Planet

In this video, Sal shows how the sine and cosine of an angle are defined on the unit circle. He inscribes a 30-60-90 triangle in the unit circle and explains how to use SOH-CAH-TOA to find the circle's coordinates.

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Concepts
cosine, trigonometric ratios, sine, unit circle, Trigonometry
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Additional Tags
Trigonometry, 30-60-90 degree triangle, soh-cah-toa, sin, cos sine, cosine, unit circle, math
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Classroom Considerations
  • This video is hosted on YouTube