How did ancient egyptians use geometry

The ancient Egyptians displayed their considerable grasp of geometry in a number of ways. What is arguably the most obvious is the way geometry was used in the construction of the pyramids and other buildings and monuments. Certainly they laid out their cities using geometric principles. It was Ahmes (actually Ahmose), who left us with a fine approximation of the value of pi from that time. In other words they used geometry by building pyramids.