One possible way to get RET'ers off our backs is to go measure the circumference of "Antarctica". According to a flat earth map, the rock we live on looks like a circle with the north pole at the center and the "south pole" just beyond an ice wall around the circumference of the map. Accordingly, the inner circumference of the ice wall (what RET'ers call the outside of Antarctica) can be measured with the following:
s = r(theta), where s is the circumference, r is the flat earth radius, and theta is 2*pi. This is also known as C=2(pi)r.
Because the observable radius of the flat earth (from north pole to ice wall) is 20,037 km (trust me, I used a tape measure), this puts the inner circumference of the ice wall at 125,896 km.
No chicanery or subterfuge there; this is simple 2-D geometry.
If someone were to sail around "Antarctica", the resulting circumferential measurement would have to be 125,896 km. Clear as day.
This would directly contradict RET, which claims a measly 15,000 km circumference of the "continent" "Antarctica."
Once we successfully measure the perimeter of "Antarctica," we'll be as sure that the earth is flat as we are that an infinite number of tortoises support the earth.