I never got beyond calculus in school, and I’ve heard this term thrown around by smart math and science people bit have no clue what it means or why it’s special.
In: Mathematics
Eclidean geometry deals with planes, like drawing angles on a sheet of paper. Other geometries deal with drawing them on a sphere or a saddleback (hyperbolic).
When you draw 90° angles on a paper you’ll be pointing back at the angle you started after 4 times (a square). On a sphere, think of the earth, you can start at the north pole, go to the equator, turn 90°, ride the equator for a quarter of it, turn 90° again and go back to the north pole… Just turn 90° a third time and you’ll be pointing back to where you started.
One geometry sums to 360° the other just to 270°. But always with right angles and forming a closed figure.
Also on a sphere, two parallels meet.
I hope you get an idea how eclidean geometry differs from others (there are many more “rules” if you wanna dive a bit deeper).
Also, of course, a smaller square can be drawn on the surface of the earth, like your room. Also, two parallels at those sizes don’t meet xD
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