Do your students have trouble remembering the different types of triangles? Much of students lack of memorization of they types of triangles is lack of exposure to them. You talk about them for one or two lessons and you expect students to remember them. To help my students to learn them, I use my calendar to help me. Everyday we do Calendar Math time and we spend 5-7 minutes working on that months topic and other math concepts. These triangle cards were designed to go with a calendar math program. They follow an ABBC pattern. They help students to remember these three types of triangles and their attributes. By the end of the month students should know acute, right, and obtuse triangles.