Reflection: Staircase of Complexity Radians Day 1 of 2 - Section 1: Warm up and Homework review


One of the major jumps in trigonometry during Algebra 2 is the addition of angles outside 0o to 90o. This is a major conceptual shift that challenges many students.  Once they have the concept of reference angle, the next major hurdle is to identify the sign of the trig ratio.  I have found the students need a lot of experience dealing with this to master it. 

This warm up is a small step in that direction.  The goal is that the students remember that cosine (on a unit circle) is the x coordinate as this can REALLY help them intuitively figure out the sign rather than rote memorizing.  The key here is that both girls are right given this information.  Some of my students like Warm Up 1 figured this out.  This student 2 figured it out but didn’t connect that both were true.  I would say around 30% of my students gave me entirely incorrect answer, like 3.  Talking about this warm up as a class was the key to getting that 30% on board.  

  Staircase of Complexity: The Next Step
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Radians Day 1 of 2

Unit 9: Trigonometric Functions
Lesson 4 of 19

Objective: Students will be able to use radians to measure angles.

Big Idea: The stars in the sky are not necessarily the best way to measure angles, this lesson explains why.

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4 teachers like this lesson
Math, Trigonometry, Algebra 2, Radians, master teacher project, degree, 11th Grade
  55 minutes
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