Submitted by Mr. Donald C. Albin Jr.
Professional Educator
www.donaldalbin.99k.org
Explore how the unit circle relates to right triangles and to trigonometric functions.
Directions

Click on a check box.

Questions to promote inquiry

What patterns do you see?

What number appears most in the labeled points? Why?

Some angles are drawn in red; others in white? What is the significance of the different angles?

How do you read the sine and cosine off of the unit circle?

What "special" occurrence happens at 360°?

How do you translate between a unit circle and a trigonometric curve? What is the relationship?