This will be an in-depth study of triangles.

We begin by classifying triangles according to their angles and their sides.

The Angle Sum Theorem is introduced with an interesting hands-on activity.

A major emphasis in this study is the congruence of triangles. We start by using slides, flips, and turns, to gain experience with corresponding sides of congruent triangles. This leads to proving that triangles are congruent or not by use of the SSS, SAS, and ASA postulates, as well as the AAS Theorem.