The distance from the North Pole to the equator is 6200 miles to 2 s.f.
The circumference of the equator is 25 000 miles to 2 s.f
I didn't get these figures from the CIA website. They are facts that are widely accepted and that are assumed to be true by thousands of people who use the round Earth model on a daily basis in their working lives: astronomers, cartographers, meteorologists, geologists, sailors, navigators, air traffic controllers, the military, air line pilots.
If the Earth is flat and the distance from the North pole to the equator is 6 200 miles that would give the equator a circumference of 39 000 miles.
If the Earth is flat and the circumference of the equator is 25 000 miles that would give make the distance from the North pole to the equator 4000 miles.
The flat Earth model doesn't fit at all, it's not even just a little bit out.
Now, if these figures are wrong how is it that all these professional people using the round Earth model don't notice that it is catastrophically inaccurate?