Put a post in the ground.
Tie one end of a length of rope to that post.
Stretch the rope out to its full length.
Walk in perfect circle.
I’m confused...
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