What is Non-Euclidean Geometry?
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Essentially it’s the illusion of straight lines on surfaces that aren’t actually flat.
You go South a 1000 miles from the northpole, west 1000 miles and north 1000 miles again. That’s two 90 degree angles and a far far smaller angle.
It doesn’t add up to the 180 of a triangle despite having three sides.
In reality if you drew your route on a map, the lines are curved.
This behaviour gets way more complex when you look at shapes that are more complex than spheres.
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