Introduction to Trigonometry (Algebra 2 Unit 14)

Learn basic trigonometry and trigonometric skills.
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List and identify the 6 trigonometric functions
Understand the relationship between sides and angles of a right triangle
Determine which trig function to use in a given problem
Solve trig problems - including trig word problems
Solve problems using angles of depression and elevation


  • A video player is necessary (mp4)
  • Headphones or a way to listen to the provided audio
  • Geometry knowledge


This unit is the first in a High School Algebra 2 curriculum. It teaches basic trigonometric concepts so that they can be applied to algebra 2 concepts later on. It can be taken by traditional high school students as well as High School Equivalency (HSE) students who are learning about geometric topics for their equivalency exams (GED, TASC, and/or HiSET).Topics include:

(1) Introduction to Trigonometry

(2) Special Right Triangles in Trigonometry

(3) The Other Three Trig Functions

(4) Solving Trig Problems

(5) Angles of Elevation and Depression

Each section has a related video, a video quiz, and a section quiz. The video quiz is to be taken along with or shortly after watching the video. The section quiz is to be taken after. To supplement the course, you can use any textbook.

This course should take approximately five to ten hours to complete.

Who this course is for:

  • Current Algebra 2 students
  • Algebra 2 teachers who would like additional resources
  • HSE/GED students studying for the HSE exams (GED, TASC, HiSET)

Course content

7 sections7 lectures1h 18m total length
  • Introduction to the Course


Math Teacher
Matthew Gromlich
  • 4.5 Instructor Rating
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I am a High School Math and High School Equivalency teacher in Las Vegas, Nevada. I also teach math and math methods courses at various colleges and universities in the Las Vegas Valley area.

I have degrees in math and science education, and recently obtained my Ph.D. in Curriculum & Instruction: Mathematics Education from UNLV.