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.
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Based on the URLs, the most credible online source is http://www.azstate.edu because .com represents a commercial website, while .edu represents an educational website, so http://www.azstate.edu will provide the best and most trustworthy information.
We need more context . What book or what is this based off of