Learning Resources Giant GeoSolids. These large transparent 3-D shapes provide a hands-on way for young learners to explore a variety of mathematical concepts. Specifically designed to introduce geometry, these durable plastic shapes also provide children with the opportunity to explore measurement, area, volume and capacity. Removable bases allow the shapes to be filled with liquids or solids and are easy to clean. Clear design enables children to see all angles and vertices. Includes cone, sphere, hemisphere, cube, cylinder, rectangular prism, hexagonal prism, triangular prism, square pyramid and triangular pyramid. Shapes measure 15cm H. Includes Teacher's Guide. Suitable for ages 8+