Surely, three sides are better than four?
I thought you might be able to answer the following query.
Looking at the world around us, I can't understand why tall buildings are built as they are.
Why aren't tall buildings built like the pyramids, with triangular walls instead of rectangular ones?
A triangle is inherently stronger than a rectangle. Such a shape also offers less wind resistance at the top, where it is most troublesome.
Loads are also distributed better.
Eddie Ford BSc, West Midlands