**Classifying Triangles:**When one of my math classes was studying the names of polygons, their properties, and the measurement of their interior angles we made several entries in our interactive notebooks. We made this T-chart to review the classification of triangles by their sides and angles. We folded the triangles over and glued them on the chart. On the outside we wrote the names of each type of triangle and on the inside the students wrote the properties for each type of triangle.

Download the template for free below!

**Writing in Math:**To reflect on the classification of triangles and lead into the concept of the measurement of the interior angles of a triangle students were asked to write whether or not a triangle could have two right angles. They also had to draw a representation to show reasoning and proof of their response.

**Triangle Interior Angle Measurement:**In past years I've used a piece of construction paper to model this for the class. I cut a diagonal to make a triangle. I would tear off each angle and put them together on the board or digital projector to demonstrate that the angles, when put together, make a line which is 180 degrees. Since I have been developing interactive notebooks with my classes this year I wanted them to have this activity glued in their notebooks.

I decided to use 3 different types of triangles to demonstrate that it is true for all of them. I made two of each triangle so they could see the original as well as the triangle with the angles removed and glued together. The activity went really well in class and was a great visual reminder for other angle measurement concepts we studied later in the chapter.

## Free Stuff!

Download a free triangle classification template! Please visit my TpT store for more interactive notebook activities! |

classifying_triangles.pdf |