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in reply to @mya's post:

the usual definition of a triangle requires "straight" edges, but what straight means can depend on geometry. (e.g. a sphere is a non-Euclidean space and triangles on a sphere have geodesic lines: straight wrt the sphrere surface but bent when looking from outside).

so i guess this is either non-euclidean or using some other definition of triangle

either way im Intrigued

Looking at this is frustrating me. It feels like I Should be able to make a proof out of this but I either don't know how to or there's just not enough information here to make a proof

If this is Euclidean I still have to make multiple assumptions, that the shortest distance between all 3 points in fig A and B are the same, that the curves in fig B are actually semicircles, because then the math checks out, it works, but I had to make these assumptions which makes this proof invalid for anything concrete in the first place

If this is non-euclidean then I'm fucked because I don't know how to prove stuff in that, but I wouldn't know that, because that information was not given to me

Either way, I need information that this figure is lacking and my head hurts from thinking this after not touching math for 2 years, I'm most likely getting things wrong with this as well

in reply to @lexi's post: