I’ve read that experts marvel that the sides of the Great Pyramid are exact multiples of Pi.
Make a round wheel. Put it on an axle on a stick. Measure distances by counting revolutions (noted my a mark on the edge of the wheel.
Exact multiples of Pi
What I’d like to know how they transported those huge stones ( and I have been to Stonehenge - in 1976 in fact - when one could still walk right up the stones and touch them ) from Wales to Salisbury Plain .