Mr. Unit Circle

The unit circle is very useful in many trigonometric equations. The unit circle is set on a graph with the main points being at 0, 90, 180, 270, and 360 degrees. In between these angles are several smaller angles such as 45 degrees and 60 degrees and all of these have a radian measure and points on them. The points on the angles correspond to their sine and cosine with sine equalling the y value and x equalling the cosine value. Tangent can also be represented in these points through sine/cosine or y/x. Here is a picture of a unit circle.