Reflection: Adjustments to Practice Coterminal and Reference Angles - Section 2: Reference Angles


I have typically taught the material in this lesson by giving students the definition and practicing several examples.  The goal of developing a deep understanding requires a different approach. In line with the Common Core, I will not test over just finding coterminal angles and reference angles. It is now more important that my students can use these concepts in problem situations.

I feel that the method used in this lesson is an improvement over my earlier lessons.  By the end of the lesson, my students explained how to find coterminal angles and the class formalized a rule (with some help from me on notation). My students also know how to find reference angles by determining the quadrant of the angle and then finding the distance from the x-axis.

I will continue with these ideas as I move from angles to finding the values of trigonometric functions. The students will see how to use these ideas to solve problems.

  Common Core vs old curriculum
  Adjustments to Practice: Common Core vs old curriculum
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Coterminal and Reference Angles

Unit 7: Trigonometry as a Real-Valued Functions
Lesson 4 of 13

Objective: SWBAT describe the measure of angles as rotations in the coordinate plane.

Big Idea: What happens when we have angles more than 2*pi or 360 degrees?

  Print Lesson
Math, trigonometric ratios, coordinate plane, radian measure
  40 minutes
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