Build-it-Triangles is a hands on activity exploring different types of triangle classifications. This is a 10th / 11th grade Geometry lesson designed to help students work with triangle classification vocabulary: Acute, obtuse, right, equiangular, equilateral, scalene, and isosceles. Students are recommended to work in groups of 2 or 3 to discover what triangles can be made with slips of paper. Each group is to receive 6 slips of paper with the following side measures: 2in., 3in., 3in., 3in., 4in., and 5in. It is recommended that students have access to protractors, though not required.

Prior knowledge needed: Pythagorean Theorem

Included in this activity is the worksheet (1 page) and measured slips of paper.