This discovery learning activity provides guidance for students to discover the triangle inequality theorem (the lengths of sides for which it will be form a triangle). Included in this document are two versions of the activity to allow differentiation of the lesson - one being open ended and the other more guided.
Supplies that must be provided in order for students to complete this activity: straws cut into pieces of specified lengths. Colors are listed for the different lengths to make the activity easier for students, but if those colors cannot be obtained the document can be edited to suit your individual needs.
This lesson is also aligned to the Common Core and the standard is included in student-friendly language so students can self-assess at the end of the lesson.