DIMENSIONS OF THE FLAT EARTH: radius, diameter, circumference, distance to Equator, Antarctica

Could the flat earthers out there let me know if I got the flat earth dimensions right? Am referring to this:
https://wiki.tfes.org/Eratosthenes_on_Diameter
(by the way the math for the diameter is wrong in that ref 😂)

Length of a meridian on sphere earth: 20000km (12429 mi)

Radius of sphere earth: Radius of flat earth:
6371km / 3958 mi 19714km / 12250 mi
-------------------------------------------------------------
Diameter of flat earth: Diameter of sphere earth:
40233 km / 24500) 12756km (7926 mi)
-------------------------------------------------------------
Circumference of flat earth: sphere earth:
123806 km / 76930 mi 40075 km / 24901 mi
Circumference of
(So circumference of globe earth = roughly diameter of flat earth)
-------------------------------------------------------------
On flat earth, travel from north pole along a straight line to the 'ice wall' is 12250 miles
On sphere earth travel to antarctica from north pole along meridians is approx 19955 km / 12400 miles (roughly equal to radius of flat earth)
-------------------------------------------------------------
On sphere earth length of north pole to equator along a meridian is 10000km (6213 mi)
On flat earth distance to equator from north pole is (I assume) 9857 km (6125 mi)
-------------------------------------------------------------

CIRCUMNAVIGATION OF ANTARCTICA:
On sphere earth, 22000 km /13670 miles
On flat earth, 123806 km (76930 mi approx)
(Google Antarctica Cup Yacht Race)