Trigonometry
Sine, cosine, and tangent from triangles to the unit circle — the math of angles, waves, and rotation.
Ms. Alicia Fontaine
Trigonometry Teacher
Common questions
Who is "Trigonometry" for?
It is written for learners at High School level (Grades 9–12), and for anyone older who wants a clear refresher on mathematics. Sine, cosine, and tangent from triangles to the unit circle — the math of angles, waves, and rotation. There is no application or entry test — you can start the first lesson straight away.
How long does the course take?
There are 3 lessons totalling 24 minutes of reading and quizzes, laid out over 3 units. You can move at your own pace — progress is saved as you go.
What do I need to know before starting?
No prior coursework is assumed. The course opens with "Right-Triangle Ratios", covering soh-cah-toa and solving sides, so the foundations are built in rather than expected.
Is the course free?
Yes. Every course on Monster Class is completely free, with no credit card, trial period or paywall. Creating a free account simply saves your progress, XP and place on the leaderboard across devices.