Online LearningMath and Science5 Best Online Trigonometry Courses/Training for 2024

5 Best Online Trigonometry Courses/Training for 2024

Trigonometry is a mathematics study that focuses on the relationship between side lengths and angles of triangles. A thorough understanding of the subject is necessary for further study in various fields, including mathematics, physics, engineering, and many more.

Most students typically learn trigonometry for the first time in high school. Some students manage to excel in no time, while many others struggle throughout.

Since trigonometry is not easy to master, you are still on the right track despite belonging to the second category. However, you urgently need to quell this weakness if you want to pursue STEM majors in college.

Currently, there are several online trigonometry courses that you can take to strengthen your skills. Unfortunately, not all of them are of high quality. Thus, this article will only feature the best course and training, so you can start upskilling right away.

Affiliate Disclosure: This article from Victory Tale contains affiliate links. We will receive a small commission if you enroll in the courses through them.

Nonetheless, we always value integrity and prioritize our audience’s interests. You can rest assured that we will review each course truthfully and thoroughly.

Things You Should Know


Most courses require you to have prior knowledge of the following:

  • Algebra
  • Geometry

You do not need to master those like a mathematician. A high-school level would be sufficient.

Course Criteria

  • Taught by an experienced math tutor
  • Available on a user-friendly platform
  • Equipped with sufficient practice tests and quizzes
  • Provide excellent value for money
  • Receive primarily positive reviews from actual students
  • My personal experience with the course, instructor, and platform (if any) must be positive.

1. Become a Trigonometry & Precalculus Master

This Udemy course by Krista King is an excellent choice for high school students who want to master trigonometry and prepare themselves for future calculus courses.

Unlike traditional math instructors, Krista teaches the subject using a different approach, allowing students to grasp the essentials without spending hours memorizing.

best online trigonometry courses

Course Content

Below are the topics that you will learn from this 14.5-hour course:

  • Angles – Positive/Negative Angles, Quadrants, Degrees, Radians, DMS, Coterminal Angles
  • Trig functions – Sine and cosine functions, Tangent Functions, and their reciprocal identities
  • The Quotient Identities, Pythagorean identities, Undefined trigonometric functions
  • The Unit Circle
  • Angles in circles – Arclengths, Radians, Linear and angular velocity
  • Inverse trigonometric functions
  • Graphing trig functions – Sketching sine, cosine, tangent, cotangent, Period & Amplitude, Horizontal & Vertical shifts, Transformations & Combinations
  • Trigonometric Identities – Sum-difference, Cofunction, Double-angle, Product-to-sum, etc.
  • Laws of sines and cosines

Generally speaking, this course will cover all the trigonometry basics that high-school students need to know before calculus. The curriculum is also well-structured, as all concepts are explained on top of the former. This makes it super easy for beginners to follow.

Apart from the lectures, the instructor provides every student with several supplementary learning resources, including informative, downloadable notes, 470+ practice problems, and a workbook. Hence, you will have everything you need to master high-school trigonometry.

Note: I recommend watching some of the free lessons before buying the course to ensure that you are fond of this approach.

Reviews: 4.7/5.0, Students: 30000+

Pros & Cons


  • Unarguably one of the best trigonometry courses for high-school students
  • Well-structured curriculum
  • Clear explanations of concepts with plentiful examples
  • Excellent voice quality + Easy-to-understand accent (optimal for international learners)
  • Provide a set of helpful learning resources
  • Lifetime Access + 30-day money-back guarantee
  • Inexpensive ($20 or lower when on sale)


  • Several students point out that the quizzes do not match the lectures in terms of difficulty. In other words, the quizzes are considerably more difficult as some may require the use of algebraic functions not mentioned in the course.

2. Trigonometry – The Unit Circle, Angles, & Right Triangles

This course by the Organic Chemistry Tutor is another exceptional option to consider, especially if you are looking for slightly more informative training than what Krista offers.

Course Content

The video content of this course is 19.5 hours long, comprising the following topics:

  • Deep dive into Angles – Types of angles, Quadrants, Degree/Radian conversions, Arclength, Angle Measure, etc.
  • The Unit Circle and how to use it to interpret trigonometric functions
  • Right Angle Trigonometry
  • Trigonometric functions of any angle
  • Graphing Trigonometric Functions
  • Inverse Trigonometric Functions
  • Trigonometric Identities & related formulas and how to use them (i.e., simplifying trigonometric expressions)
  • Tips to solve trigonometric equations
  • Laws of sines and cosines
  • Polar coordinates and graphing polar equations
  • and many more

Compared to Krista’s, this course will focus more on practical tips and techniques to solve problems, which can be extremely useful in the exam. Thus, suppose you struggled with your previous trigonometric exam. You may want to give this course a try.

Each video lesson is bite-sized. Most of which are only 3-7 minutes long, so it is effortless for students to go back and review some topics before the exam date.

However, the only drawback is that this course has fewer practice problems than other alternatives. There are only 5-10 problems for each section, which can be insufficient for proper exam preparation.

Note: The instructor generously allows visitors to preview some lessons for free. I highly suggest doing so before making decisions.

Reviews: 4.7/5.0, Students: 2000+

Pros & Cons


  • One of the best options if you are struggling with high-school or college-level trigonometry
  • Easy-to-follow curriculum
  • Bite-sized lessons (3-7 minutes long for each)
  • Step-by-step explanations with numerous examples
  • Focus on practical tips & techniques
  • Lifetime Access + 30-day money-back guarantee
  • Inexpensive ($20 or lower when on sale)


  • Fewer quizzes and practice problems than other options
  • Inactive Q&A forum

3. College Algebra & Trigonometry Explained

Suppose you are looking for a comprehensive course on college-level algebra and trigonometry. I don’t think any will better fit your needs than this gigantic course from John Greene.

Course Content

This course is 111.5 hours long, many times longer than other alternatives. It will start with the fundamentals and gradually delve into more advanced concepts of algebra and trigonometry.

Below is a summary of topics you will learn in this course:

  • Basic Algebra Review, Polynomials, Rational/Radical Expressions
  • Linear equations and inequalities + Applications
  • Deep dive into functions (Polynomial, Inverse, Exponential functions, etc.)
  • Sequences, Series, Probability, Binomial Theorem
  • Matrices
  • Introduction to Trigonometry – Angles, Radians, The Unit Circle
  • Graphing trig functions
  • Trigonometric Identities
  • Trigonometric Equations + Inverse trigonometric functions
  • Laws of sines and cosines
  • Vectors and Complex Numbers
  • Polar/Parametric equations

In general, the curriculum is comprehensive. It starts from high-school algebra and gradually progresses to more advanced topics. Each concept is explained in a logical order. Hence, this approach makes this course beginner-friendly.

However, completing all course content can be extremely consuming. I suggest skipping the algebra part altogether to speed up your learning if you are already familiar or adept with it.

On the other hand, suppose you do not have a good foundation in algebra or mathematics in general. I suggest taking the course from the start, as the instructor has done an excellent job of breaking down abstract concepts into what students can understand promptly.

Furthermore, he did not assume that his students are good at introductory algebra, so his explanations are detailed and step-by-step. This approach can be absolutely beneficial if algebra is not what you excel in.

Like other Udemy courses, you can audit some lessons for free.

Reviews: 4.7/5.0, Students: 1330+

Pros & Cons


  • Best trigonometry/ pre-calculus course for students who are not good at algebra
  • Comprehensive curriculum
  • Informative lessons packed with tons of examples
  • Clear, step-by-step explanations of concepts
  • Provide numerous educational resources (more than 3500 practice questions)
  • Lifetime Access + 30-day money-back guarantee
  • Inexpensive ($20 or lower when on sale)


  • Completing the course can be too time-consuming.
  • Some lessons are not bite-sized.
  • Some students noted that the instructor’s handwriting was difficult to read.

4. Brilliant’s Trigonometry Online Course

Using an entirely different teaching approach, Brilliant is the best choice for those who want to understand trigonometry by heart, not just score high on the exam.

Course Content

Brilliant utilizes interactive learning in all of its courses. You will learn from visual graphics, creative explanations, and thought-provoking questions that come with it.

Based on my observations, it resembles playing computer games, but you will learn tons of crucial concepts in the process. I am sure that your learning experience will be far more entertaining than that of an online college trigonometry class.

The image below shows how it works. First of all, it starts with the graphics and the explanations.

Subsequently, you will answer a thought-provoking question.

You can open the explanation if you get it wrong. I find it pretty informative but effortless to understand. Brilliant even uses animations to explain the solution for some problems. This will enable you to understand the complicated stuff more quickly.

Brilliant uses animations (bottom right) to explain the solution.

Currently, Brilliant’s trigonometry curriculum consists of the following topics:

  • Introduction to Trigonometry
  • Trigonometric Ratios and Functions
  • Applications
  • Cartesian Graphing
  • Polar Graphing
  • Trigonometric Identities

Upon completion, you will understand the fundamentals intuitively and thoroughly and grasp tips and techniques to apply those concepts in real life. You can then focus on the practice questions.

However, the drawback is that Brilliant does not offer many practice questions. You will need to purchase books or other online courses if you need to prepare for the upcoming exam.

You can create an account to try some first lessons for free.


Brilliant uses a subscription-based pricing model. The monthly subscription costs $24.99, or $12.49 (billed annually). Once you subscribe, you will be able to access all courses platform-wide, including trigonometry, physics, and even Python programming.

Nevertheless, suppose you want to learn only trigonometry. I do not think you will need an annual subscription as most students can complete the entire curriculum within 10-12 hours.

Pros & Cons


  • Utilize interactive learning, which offers the most entertaining trigonometry lessons online
  • Easy-to-follow curriculum
  • Creative explanations of key concepts
  • Excellent visual graphics and animations
  • All-in-one pricing: Students can access all courses on the platform


  • Offer a few practice questions and quizzes

5. Varsity Tutors

Suppose you are still struggling despite taking some online courses or want to grasp tips to solve the most challenging problems on the exam. In that case, I recommend hiring a certified tutor from Varsity Tutors instead.

The tutor can then identify your weaknesses, resolve your misunderstandings and frequent mistakes, and suggest the right strategy for your upcoming exam.

Varsity Tutors is the market leader in the private tutoring space. The company claims to boost grades and scores for 80% of its students. Hence, I think this alternative is 100% worth consideration.

How It Works

The hiring process is simple. You just need to complete the questionnaire, and the representative will contact you via phone or email.

Subsequently, you will be assigned a tutor and start taking trigonometric classes based on the curriculum tailored to your needs.

All tutors from Varsity Tutors have degrees from leading US universities and are meticulously vetted. Hence, you can be confident that the instructions will be professional and top-notch.

Classes will be live online. You will be able to ask questions, complete assignments, and even rewatch the entire session (if needed). You can also request your tutor to focus on topics you still have not understood well.

Regarding pricing, Varsity Tutors does not offer pricing information on their site. However, according to the reviews, you should expect to pay $50-$100 per hour.

Pros & Cons


  • Best for trigonometry students who are still struggling with the subject or those who aim for an A or A+ on the exam
  • Live online instruction from certified tutors: providing a better learning experience than self-paced online trigonometry classes
  • Exceptional live learning platform with many features
  • Personalized curriculum


  • Costlier than other alternatives

Free Trigonometry Courses

Khan Academy – Khan Academy offers a free online course on trigonometry (in a video format). Although it may not be as informative as paid video courses, it still provides excellent insights on the subject.

Related Courses

  • Calculus
  • Differential Equations – Coming Soon
Pun Anansakunwat
Pun Anansakunwat
Founder of Victory Tale, a multipotentialite who has a particular interest in technology. He loves to spend time testing new products and learning interesting topics to broaden his insights. After graduating from Columbia University in 2014, he makes a living by being a stock market investor, a private tutor, a writer of three published books, and finally a website owner.

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