From Circle-ometry to Trigonometry

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.

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CCSS: Designed
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

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

  • None