Reflection: Developing a Conceptual Understanding Radians Day 1 of 2 - Section 5: Converting Between Radians and Degrees


I ended up having to split this section between today’s lesson and the next one.  Rather than give my students the formulas π/180 and 180/π, I worked on getting the students to make sense of and come up with a method for figuring how to convert between degrees and radians.  Many of them were to be able to take degrees and convert them to Radians  It made sense that we had to find what percent of 180o the given angle was and this was the radians.  This is where we got to on the first day. 

Going from radians to degrees the next day proved to be a bit more challenging.   When we looked at it in terms of 2π/3 is 2/3 of 180o, this seemed to help a bit.  I think if I change anything, I will extend this with a few more practice problems and insist that they write down clearer notes.  Several students did not write clear enough notes and then had nothing to refer back to towards the end of the chapter.  

  Developing a Conceptual Understanding: Avoiding The Formulas
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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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Math, Trigonometry, Algebra 2, Radians, master teacher project, degree, 11th Grade
  55 minutes
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