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.

Concepts

trigonometric ratios, sine

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Additional Tags

math

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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

Common Core

SL.9-10.2 HSF-TF.A.2 RST.9-10.7