I have mentioned that I can’t attend Worldcon this year due to the circumference of the Earth. Lurkertype has asked whether I could attend if the Earth were flat. Let’s see.
The surface area of the earth is approx : 510,072,000 sq km.
Treated as a two-dimensional circle, this would give a radius r=of square root (510072000/pi). The circumference of that would be c = 2*r*pi.
So r works out at about 12,742 kilometres for our flat Earth, which is double the radius of the spherical Earth. The circumference of the flat Earth is therefore 80,060 kilometres, which is basically double the circumference of the spherical Earth.
So, if I have to travel the circumference of the Earth to get to San Jose (which I have to for reasons due to occult geometry rather than practicality) then I have to travel twice as far, making the trip less feasible.
However, if we change Earth into a four-dimensional analogue to a sphere (known as 3-sphere or 4-ball depending on what aspect we are looking at) then I can get there.