The unit is arbitrary. Let’s say 1 unit of measurement equals the radius of the wheel. As long as they used the same wheel for all sides of the pyramid, each side will follow the formula: n * 2 * pi where ‘n’ is an integer (whole number). The formula could easily be written in any other unit of distance by multiplying by the conversion ratio.
Are we implicitly using their units? Metric factors of pi would be quite surprising.
The unit is arbitrary. Let’s say 1 unit of measurement equals the radius of the wheel. As long as they used the same wheel for all sides of the pyramid, each side will follow the formula: n * 2 * pi where ‘n’ is an integer (whole number). The formula could easily be written in any other unit of distance by multiplying by the conversion ratio.