This is a one-semester, High School Trigonometry course offered in either the fall or spring semester.  Structured on the free OpenStax textbook Algebra and Trigonometry, each lesson includes an active learning activity, a walkthrough video of the activity, a traditional lecture video, instructor graded worksheets with feedback, and tests.

The course is $60 per month and billed recurringly from August through May. 

Trigonometry has no class on Fridays and covers one chapter of PreCalculus.