The pi ratio is strong evidence that a wheel is used somewhere in their surveying tools. When I was a boy, I asked my mom how the Egyptians made their pyramid

The pi ratio is strong evidence that a wheel is used somewhere in their surveying tools. When I was a boy, I asked my mom how the Egyptians made their pyramid foundations straight. Without looking up from her book, she replied "pull a string tight". Then I thought I'd trip her up with how they made the foundation level. Without hesitation she said "dig a trench and fill it with water." She shoulda been an engineer!