| Perfectly shaped crystals are polyhedrons with many sides, such as tetrahedrons that have four triangular faces. |
| Volumes of solids such as prisms, pyramids, tetrahedrons, wedges, cylinders and truncated cones are calculated. |
| The entire structure is a multitude of tetrahedrons with each component attaining maximum efficiency. |
| Splitting for compliance is applicable to triangles or quadrangles with a split edge, and to tetrahedrons with 1, 2 or 3 split edges. |
| We call molecular recognition this ability to recognize first of all spheres, and then more complex shapes like tetrahedrons. |
| Clay consists of a network of atoms stacked to form hollow octahedrons and tetrahedrons. |
