This unit was designed for 4th Grade math students. It could be used for Advanced 2nd/3rd graders or as review/reteaching for 4th/5th graders. All pages are fully-editable in MS Word. See the preview for the first lesson and part of the quiz. This unit is hands-on. Each lesson includes directions for making and using a set of straws and pipe cleaners to construct various kinds of triangles. These can be made once and used over and over again - year after year - and in many other geometry units!