This CUBE AND STACK PUZZLE asks student teams of three to identify scalene, equilateral, and isosceles triangles using sides. Each student gets a different cube template (1 of 3). Each student in the team cuts out and constructs their cube. They then work together to stack their 3 cubes so that facing sides describe the same triangle. It is challenging, but my students think it's fun. I've used this activity for review, to teach a concept after a brief introduction, in after school help sess