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Author: Cassandra Rehm
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* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 26 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Trigonometry is the relationship between the sides and angles of a triangle; however, this relationship represents a measurement.  In this lesson, we are going to study the properties of triangles and how to use the applications to determine the measurement of the triangle.  Below I have provided some videos that will help in your understanding of this topic.

Here is one way to remember the unit circle!

Here is another way to remember the unit circle. I find this one most interesting! Not to mention it is easy to remember.

Below I have provided a Trig Cheat Sheet that was created by Lamar University which is located in Texas.  This may be used as a study guide; however, this cannot be used on a quiz or test.