Can you use triangles to create a circle? Learners develop the unit circle using right triangle trigonometry. They then use the unit circle to evaluate common sine and cosine values.

Concepts

trigonometric ratios, unit circle, sine, cosine, special right triangles

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Additional Tags

math

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Instructional Ideas

• Give pupils a coordinate plane with a circle and have them measure the 30, 60, and 45 degree angles to use during notes
• Have learners use special right triangles to find the ordered pairs at 30, 60, and 45 degrees

Classroom Considerations

• Expects learners to understand trigonometric ratios and special right triangles

Pros

• Uses concepts developed over the previous few lessons in the series
• Resources include extra problems for independent practice

Cons

• None

Common Core

HSF-TF.A.2 HSF-TF.A.3 MP3 MP4 MP5