This text gives an introduction to trigonometry, using both degree and radian measures. It uses a reference triangle approach that is suited for the student new to trigonometry. The text is most appropriate for an Algebra II course. It’s also an ideal resource for students working on their own to either pass out of Algebra II or to review and remediate. With plenty of worked examples, many video tutorials, a complete answer key, and a straightforward approach, it’s the perfect companion for students working outside a traditional school environment.