Measuring Triangles Learn by Doing Activity

Understanding the connection between Right Triangle Trigonometry and the Unit Circle by

measuring and physically manipulating right triangles within a circle of radius 1 decimeter.

This activity is optimal if you print the page with the One Decimeter ruler and six triangles on

colored card stock paper. However, it will also work if all pages are printed on standard printer

paper.

1. Print out one copy of each of the following pages.

2. Carefully and accurately cut out the One Decimeter ruler and the six right triangles.

3. Grab a pen or pencil, a calculator, and a straight edge if you have one (not required, but useful).

4. Now you are ready to follow along with the video guide.