We recently spent time during our geometry lessons working with angles. The fifth years learned how to calculate the area of triangles using a formula after they had lessons with the materials for right angle, obtuse angle, and acute angle triangles. Next, they spent time making enormous triangles on chart paper and calculated the area of their own triangle to display in the classroom. The fourth years each used a set of tan grams to create congruent figures based on very specific directions. One set of tan grams consists of two large triangles, one parallelogram, one small square, one medium triangle, and two small triangles. They are looking forward to more future lessons with the tan gram materials!