Based on the open textbook, Trigonometry by CK-12, this course takes a right triangle approach to introducing trigonometry. Topics include right triangle trigonometry, angles, trigonometric Identities & equations, circular functions, and polar equations & complex numbers.

This course includes complete text, videos, and online assessments.

Lumen OER courses apply learning science insights to engage students and better support the learning process. Content includes text, images, videos, assessments, directed feedback, practice questions, and other interactives that invite students to apply their knowledge and improve their understanding. Lumen’s online homework system, OHM, provides frequent practice, machine grading, and immediate feedback to help students learn and master math and other quantitative subjects.