This is a Unit bundle of lessons/notes, likely for a High School geometry class, that are in the form of handouts. Introductory geometry definitions (many related to triangles) are explored in the first two lessons. The major lessons in this unit are on the Sum of the Interior Angles of a Triangle (including isosceles triangles), the Exterior Angle Theorem, the Pythagorean Theorem (many problems involve simplifying of radicals), Angle/Side Relationships in Triangles, Triangle Inequalities, and