## Reflection: Developing a Conceptual Understanding Radians Day 1 of 2 - Section 3: Radian Investigation

I got a lot of good feedback from this activity.  The students really liked the physical connection and other teachers at my school who also used this lesson said that it will well with their students.

I do have a couple of pointers to keep this lesson running smoothly.  Accuracy in measurement was a big issue.  If the students weren’t super careful when measuring the radius (which happened more than I would have liked), their measurements were really off.  Also, they wanted to put the pipe cleaner around the outside edge of the circle.  This also made the measurements incorrect.  It is better to measure a bit on the inside than around the outside.  A fellow teacher used string and had good luck with it.  I chose pipe cleaner due to its ability to hold its shape but both tools can be used successfully.  As we went to each step, I would hold up student work as a model.  This really seemed to help keep everyone on track.  When we went to measure the 0.28 radians (Student Picture), the student's percentages were really spread.  I wrote down each pairs’ percentage on the white board so everyone could see the range and then gave them the actual measurement.  This lead to a great discussion on accuracy and human error.

Developing a Conceptual Understanding: Making This Activity Successful For All Students

# Radians Day 1 of 2

Unit 9: Trigonometric Functions
Lesson 4 of 19

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

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Standards:
Subject(s):
Math, Trigonometry, Algebra 2, Radians, master teacher project, degree, 11th Grade
55 minutes

### Amelia Jamison

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