Instructional Video

Exact Trig Values - Hand Trick

Curated and Reviewed by Lesson Planet

Having trouble remembering the trigonometric ratios of the common angles? Here's a video for you! The lesson instructor demonstrates a hand trick that helps individuals determine the correct trigonometric ratios. The trick works for sine, cosine, and tangent of 0-, 30-, 45-, 60-, and 90-degree angles.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Create a guided notes document for learners to complete as they watch the lesson
Classroom Considerations
  • If assigning for independent viewing, ensure class members have Internet access at home
  • Relies on prior knowledge of trigonometric ratios
  • This video is hosted on YouTube
Pros
  • Allows time for pupils to practice as they watch the video
  • Provides a visual animation to add clarity
Cons
  • Method in the video promotes memorization rather than understanding