GeoGebra Classroom

## Video I - Introduction to Triangles

In the following video, Professor Ferretto explores some properties and exercises that were not demonstrated in this chapter, such as the sum of the inner and outer angles of the triangle. But that will not hinder learning. Focus on the exercises that cover content explored in this chapter.

## Introduction to Triangles (Enable a youtube english subtitle)

Did you grasp the explanation on the video lesson? If you did not understand, write here what you did not understand, identifying the moment (minutes and seconds) of the video the doubt arose.

## Video II - Classification of triangles

In the following video, Professor Ferretto explores some properties and exercises not demonstrated in this chapter, such as the Pythagorean sum theorem. But that will not hinder learning. Focus on the exercises that cover content explored in this chapter.

## Triangle classification-Enable a youtube english subtitle

Did you grasp the explanation on the video lesson? If you did not understand, write here what you did not understand, identifying the moment (minutes and seconds) of the video the doubt arose.