In this lesson on the unit circle, you'll learn what it is and how to use it in traditional trigonometry. The unit circle is centered around the origin and has a radius of 1 in every direction, making it the easiest thing to work with. You'll also learn how to convert between degrees and radians and the values of sine, cosine, and tangent, and how to find them on the unit circle. By the end of the lesson, you'll be able to easily find angle measures and solve any unit circle problem.
An introduction to the unit circle and unit circle trigonometry. How does traditional trigonometry apply to the unit circle? Also, several examples of finding values around the unit circle. This video gives an easy way to remember unit circle trig values. Also, there are resources to use on any unit circle problem.