[philman_36]

They won't give it to you! They don't know it!
8 inches per mile squared

[philman_36]

3 miles squared = 9

9 x 8" = 72"/6'

You should not be able to see a 6' person at all on a
flat surface at a distance of 3 miles away from you.

Lollipops (mile markers) on the roadways are great for single person observations.

Measure one, drive 3 miles away from it and pull out the binoculars.
Do you still see it all? Flat Earth.