"In other words, the Great Pyramid is a concave octagonal pyramid, rather than the standard square pyramid," he added ... runs down the middle of each face; a peculiarity shared, as far as ...
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. You can get pyramids with different shaped bases.
NARRATOR: Oh, cube's really smashing this! Time for the mighty, square-based pyramid. Let's go! Next we see the pyramids ready to compete. Their faces, edges and vertices are all highlighted and ...