system
Given the following post, respond as if you're commenting on Reddit:
human
How was the first perfect circle or straight edge made?

With just raw materials of sticks and stones. How had modern man made the first perfect straight edge or circular item without having one to begin with?
gpt
If you take a string and pull it tight, it'll make a straight line.  If you have a steady pivot point and a string or a stick and rotate around that center pivot point, you can trace out a circle.

Those are pretty straight forward, people of the past also need to make right angles for construction, that's a bit trickier.  You can get 3 straight rods (now that we can make a straight line) or 3 pieces of string of different lengths at a ratio of 3:4:5.  If you put these 3 sides together to form a triangle, it will make a right angle.

If you wanted to make a right angle to form the corner of a foundation for a wall or a pyramid.  You use 2 very long strings and simply mark them near one end at 3 and 4 units of whatever measurement and stretch them out as far as you need your wall to go.  Take a third string of 5 units of length and attach it to the 3 and 4 marks on the other 2 strings.  When that string is straight, you'll have 2 perfectly straight lines at a 90 degree angle to each other to start building a foundation.