Trigonometric (trig) functions are crucial to understand as well. Unlike the other functions you’ve learned about, trig functions are used to describe the relationships between angle measurements and the sides of the triangles that contain the angles. Katie describes how to use the Unit Circle to find sin(𝚹), cos(𝚹), and tan(𝚹), where 𝚹 is the angle measurement for common angles, and how to describe these angles in degrees or radians.