# Interior Angles of Triangles

This activity will help you meet these educational goals:

- Mathematical Practices—You will make sense of problems and solve them and reason abstractly and quantitatively.
- 21st Century Skills—You will use critical-thinking and problem-solving skills.

**Directions**

Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a brief evaluation of your work.

**Activity**

You will use the GeoGebra geometry tool to study the interior angles of triangles. Go to interior angles of triangles,

* (copy and paste in browser)*

__http://contentstore.ple.platoweb.com/content/GeoGebra.v5.0/A2.6_Interior_Angles_of_Triangles.html__

and complete each step below. If you need help, follow these instructions for using GeoGebra.

**Question 1**

Record the measures of the interior angles of *∆ABC* (*α*, *β*, and *γ*), and find their sum.

**Question 2**

Move vertices *A*, *B*, and *C* to create a triangle of your choice. Record the measures of the interior angles *α*, *β*, and *γ* for three different triangles. Then find the sum of the angle measures for each triangle.

**Question 3**

How does the sum of the interior angles change as you move the vertices of *∆ABC* to create a triangle of your choice?

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