Can you have a triangle with two right angles?

Question

On a flat surface, a triangle with two right angles is impossible since the angles would sum to more than 180. But I heard that on curved surfaces the rules change. Is it actually possible to draw a triangle with two right angles somewhere in the universe?

David Kim · Answer

Think of it this way: math doesn't invent rules, it discovers the rules that make everything work together without contradictions.

Can you have a triangle with two right angles?

1 Answer