## Reflection: Developing a Conceptual Understanding Graphs of Sine and Cosine - Section 2: Section 2: Building a Sine or Cosine Graph

There are several hints that I have to help this lesson run smoothly.  First, ensure that your materials are well organized as time is definitely at a premium in this lesson.  Keeping the class moving is also important because of time.  I was very careful in picking which groups did the Sine graph and which did Cosine.  Cosine is more challenging as you have to take the length of the x-value to find the height (or the y-value).  I assigned it to pairs that I felt could make that conceptual leap easier.  Even so, I had to go around and give some support to those groups.   When measuring the angles around the unit circle with the yarn, it is important to be clear that students start at 0o.  I had students start in other places which can mess up the graph.   The negative values also tripped some students up.  I tried to catch them all before they started gluing but a few groups had to pull them up.

Developing a Conceptual Understanding: Tips For A Smooth Lesson

# Graphs of Sine and Cosine

Unit 9: Trigonometric Functions
Lesson 8 of 19

## Big Idea: Students get to build the graph of sine or cosine with yarn and spaghetti.

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Standards:
Subject(s):
Math, Trigonometry, Trigonometric functions, unit circle, Algebra 2, master teacher project, sine function, cosine function, 11th Grade
48 minutes

### Amelia Jamison

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