Archaeologists have found a 2,200-year-old Greek pyramid-shaped structure near the Dead Sea, believed to be a former desert ...

There are five platonic solids, the tetrahedron ... A pyramid with a square base is a square-based pyramid. Image caption, 3D shapes that are non-polyhedral include cylinders, cones, and spheres.

Explains the concepts of volume for various geometric solids, including prisms ... the relationships between these shapes. For example, the volume of a pyramid is one-third that of a prism ...