no
It had not been invented. Egypt at the time of the pyramids was still in the bronze age.
They faced the pyramids, otherwise they would have been working behind their backs!
In the past the Great pyramids where used to guard the fourth dynasty Egyptian Pharaoh Khufu's temple.
The step pyramids were like practice pyramids. They were getting the engineering down and the "how to". I doubt that without them they would have been able to engineer the Great Pyramid.
Because of the water and transport it provided
yes wedges were used to build a pyramids and it was used for braking the rocks or cut and so they can build a pyramids
A very long time, it was used to design the Pyramids and Stonehenge
They used limestone blocks to build the pyramids
the pyramids were used in ancient egypt for burial tombs
pyramids are what the pharaohs lived in and it had their tombs
pythagoreans theorem was used to help build the pyramids