The materials in the geometry curriculum are uniquely designed and demonstrate the spiraling curriculum. Students in the early years experience the materials through the senses. The older students use these same materials and develop the formulas for these materials. For example, the students work with the largest brown prism in pre-K and then find the volume of the prism in the upper grades. This week the 4th year are learning about the interior angles of triangles, the 5th are working on the transitive property of equivalence and the 6th are discovering and writing the formula for the area of a parallelogram.