This document discusses triangle inequality theorems and reviewing properties of triangle angles. It recalls that the interior angles of a triangle are angles 4, 5, and 6, the exterior angles are 1, 2, and 3, and the remote interior angles of each exterior angle are the two interior angles not adjacent to that exterior angle. The document prompts the reader to find the measure of several indicated angles and solve for variable x using properties of triangle angles and triangle inequality theorems.