It's non Riemannian and therefore also non Euclidean. In Riemannian space, the distance between points is the length of the shortest path between them. Euclide

It's non Riemannian and therefore also non Euclidean. In Riemannian space, the distance between points is the length of the shortest path between them. Euclidean space is a subtype of Riemannian space, where angles in every triangle sum to 180°.