apparently they had polygons back in the 14th century
@selfsame That's very impressive. I can't even begin to think about how to do this accurately without a computer, or at least a calculator.
@selfsame Thinking about this further, I think I'd do the sin and cos calculations using a large circle drawn on graphing paper, and I'd get the result simply by measuring the distances. The amount of work that would take is ridiculous though.