Maybe that's why the "education" system has made math so confusing for kids. Modern algebra textbooks, for example, force students to memorize backassward methods to do simple steps. I was myself penalized in college Algebra 2 for skipping logical steps like not showing my math to derive 2x = 4; x = 2.

So.

If you can see targets even a few miles away, that would likely be totally impossible on a globe only 8,000 miles in diameter. Ah, but do math teachers not know this themselves? Taking target height and observer height into account, the equation 8×d^ can easily be applied in classrooms all over the alleged globe. Come on, kids!

Do an experiment and get the teacher involved. Not showing your plane tendencies, of course. Just an innocent math project to prove that we live on a tilted spinning ball in a vacuum.