The Unit Circle

unit circle  Unit Circle Hand Trick Note: This trick is best used to help remember the first quadrant of the unit circle but it can be modified to recall the whole Unit The general equation of a circle is 2 + 2 = r2, which represents a circle having the center and the radius r This equation of a circle is

See description below In mathematics, a unit circle is a circle with a radius of one In trigonometry, the unit circle is the circle of Sine, Cosine and Tangent in a Circle or on a Graph Sine, Cosine and Tangent are each a ratio of sides of a

What is the unit circle? Why is it important for trigonometry? Check our unit circle chart for values and learn how to remember them  Illustration of a unit circle superimposed on the coordinate plane with the x- and y-axes indicated