A prism is a 3D shape with a constant polygon ... A pyramid with a square base is a square-based pyramid. Image caption, 3D shapes that are non-polyhedral include cylinders, cones, and spheres.

It details the formulas used to calculate their volumes, emphasizing the relationships between these shapes. For example, the volume of a pyramid is one-third that of a prism with the same base ...

“It’s a prism with a zipper,” Javier ... it’s more like a pyramid with the pointy end lopped off. Mathematicians call that shape a frustum. Similar dynamics apply in biology.

It had been assumed that these cells adopted prism- or pyramid-like shapes to form these structures, but no one was sure as only thin cross-sections had been examined.… Receive a weekly dose of ...