When Yukinori Kawae explores the Great Pyramids at Giza, he isn’t after treasure or lost chambers—he’s looking for dimensions. For all that the pyramids have been dug, scanned, and ...

3D shapes, they have 3 dimensions ... Right, what about triangles? Triangles become pyramids. You're now a square based pyramid with 4 triangular faces and a square face for your bottom.

A pyramid with a square base is a square-based pyramid. Image caption, 3D shapes that are non-polyhedral include cylinders, cones, and spheres. At least one face is not a polygon. At least one ...