It's easy really. Start at the North Pole (let's say you have an infinite pencil that can draw on any surface for this one). Draw a straight line all the way to the equator. Turn 90 degrees. Walk exactly one quarter of the equator. Turn 90 degrees again. Walk back to the north pole.
Boom. You just drew a triangle with 3 right angles :o
A triangle's angles need to total 180 degrees only if space is flat. If space has a positive curvature (like a sphere), it will be more. If space has a negative curvature, it will be less.
No comments:
Post a Comment