I would have asked this on a math community but I couldn’t find an active one.
In a spherical geometry, great circles are “straight lines”. As such, a triangle can have two or even three right angles to it.
But what if you go the long way around the back of the sphere? Is that still a triangle?
(Edit:) I guess it’s a triangle! Fair enough; I can’t think of what else you would call it. Thanks, everyone.
Yes, it has three corners and three edges. It is a triangle.
It doesn’t matter that the edges are curved?
What if it had 3 corners and 4 edges? Or 4 corners and 3 edges?
I don’t think that can be a thing.