Regents park in London has an inner circle over a hundred years old, it is a perfect circle approximately 1km in circumstance with uneven terrain and lots of trees.
I am sure many other cities have similar large perfect circular roads.
Eli5 How did they ‘draw’ the road on this scale before building it?
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The tool theodolite in various different versions has been around for hundreds of years and is still in use today. https://en.wikipedia.org/wiki/Theodolite
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