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Using the Unit Circle Reference Angles

Core Standard: HSF-TF.A.2

Aligned To Common Core Standard:

High School Trigonometric Functions- HSF-TF.A.2

Printable Worksheets And Lessons


  • Capital T Typo Step-by-step Lesson - This is an intended typo. The problem is looking for a lower case letter, while the reference letter is upper case. It is a good exercise.

  • Guided Lesson - Again, a purposeful typo. It is good to get students in the habit of identifying this. I saw this happen on several national exams.

  • Guided Lesson Explanation - Inverse sin questions are very difficult for many people. See if this helps.

  • Practice Worksheet - A few of these are trick questions to see if students are paying attention.

  • Matching Worksheet - This isn't too difficult to work through. It should be second nature by now.

AnswersAnswer Keys



View Answer Keys- All the answer keys in one file.





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Homework Sheets

Focus on the meaning and purpose of the unit circle.




Practice Worksheets

Determine the exact value of what you are presented with.




Math Skill Quizzes

Are they all real numbers? This a question I hear often.