Geometric forms will add depth and understanding to the study of geometry. Students will use them to measure, compare, and explore edges, vertices, faces, shapes, curves, and angles. Set of 18 pieces includes a sphere, a cube, a rectangular prism, a square prism, a cone, an isosceles right triangular prism, a parabola-cut cone, an ellipsoid, and more. Sizes range from 2" to 4 1/2" (5 to 11. 5cm). Activity sheet included.