Sorry, circumference. That should solve the remainder of your issues. Give it a shot. Post your calculations as to what it would look like.
Here's how it looks in miles, with metric at the end:
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Choose your units and go for it.
By the look of the diagram you appear to be choosing your horizon as a angled look to an outside skim of your circle line, basically saying you would be doing that when looking out to sea but in your case it would be looking down into the sea and so negates any horizon you thought you had in the first place.
Try level sight.
Here's what happens with level sight and you can try this from a mountain or a hill or the seaside. Just look out to sea and you will see the horizon line which is a theoretical line based on convergence of light shades in atmosphere due to the density of it below and less dense above over distance.
Basically it hinders reflected light back to the eyes from below and allows reflective light to be more apparent, above.
Basically it gives your eyes a central (theoretical) line. Your horizon line.
You can only get this from level sight into distance.
If you set up a small scope of binoculars with a crosshair and set them level from the ground, so they're horizontally level, then look through them, you'll see your horizon.
If you were on a globe as you think you are, you would have no horizon, at all. Only sky.
Why?
Because you're already stood above your downward curve and the only way your curve goes from that point on, is downward, meaning your scope could never bring any horizon into line....only sky.
This does not happen and is another clear reason why Earth is not a globe we supposedly walk/sail upon.
But is 1+1=3 not thinking alternatively?
Of course, if you want to argue 1+1=3 then you're entitled to argue it.
I accept 1+1=2. I accept it because I use addition like we all do in life.
If you have a case for it being 3 then you are welcome to argue it.
We have all been schooled into thinking 1+1=2, so when we have an apple and add another we just think we see 2 apples.
Yep we have all been schooled into a belief of this.
It's all about using it and accepting it, or not. I accept it because I use it in real life as I know it.
There are many who may think like you do, but after years of realising the truth, they know 1+1=3 and there is zero proof it comes to 2.
It depends on what you see as proof. If you think you live on a spinning globe in a space vacuum then maybe 1+1=3 to you. I have no issue with you for you thinking thinking that but I just don't agree with either.
1+1 is 3, and anyone who thinks it is 2 is just following the narrative like a religion, claiming madness or conspiracy theorists about those who know it is 3.
Maybe they are. If you can argue otherwise then you may be on to something.
I can prove it to myself. It's up to others to decide if it fits their everyday life as a reality in use.
I think he suggested protractors had been invented as part of the lie to keep us in line earlier, I may have misread though

There's no lie about any of this.
This is about knowing a surety and how it gets to be. That's it. Use them as mind exercises.