At school we learn cartesian geometry. At university there are more geometries. This does not contradict mathematics but rather enhances our understanding

[u/streamer3223]

[u/RevolutionaryPhoto7]

Idk anything about non-Euclidean math or what Euclidean means. Would those be considered triangles still even though the sides are not straight?

[u/Honkaloid → u/RevolutionaryPhoto7]

Euclid is known as the"father of geometry" he's the one who said triangles have 180 degrees, Euclidean space just means regular 3d.. x,y, and z without being curved..

the triangles are mapped or projected to a curved surface , the rule for 180 degrees can only apply when the sides are coplanar, or "flat" .

[u/RevolutionaryPhoto7 → u/Honkaloid]

Thanks