__Unit Overview:__This unit builds on students’ previous work with functions, and on their work with trigonometric ratios and circles in geometry. Students now use the coordinate plane to extend trigonometry to model periodic phenomena.

Instructional Segment I: The Unit Circle, Radians, and Degrees

Instructional Segment 2: Graphing Trigonometric Functions

Instructional Segment 3: Proving Trigonometric Identities

__Enduring Understanding:__- Trigonometry is used everywhere where angles or curves are involved.

__Essential Question:__- How can a periodic phenomena be modeled using trigonometric functions?