Trigonometric Functions: The Unit Circle Section 4.2

Objectives I can draw and label a unit circle with key information

Unit Circle The unit circle is a circle of radius 1 with its center at the origin.

Using Special Triangles Let’s define key ordered pairs using special triangles 30°

Using Special Triangles Let’s define key ordered pairs using special triangles 45°

Using Special Triangles Let’s define key ordered pairs using special triangles 60°

These are Quadrant I key values! All other quadrants have same key values! x-values and y-values depend on quadrant.

Points on the Unit Circle

Homework Practice Unit Circle 1 min Quiz Next Class (Triangles)