on a flat surface is that if you started walking perfectly straight then made a right turn Walk the same distance and repeated this it would take three turns before you got back to your original spot But if you're on a sphere it'd be possible for you to make two right angle turns before returning to your original position This wouldn't always be the case, of course, but it is true that on a positively curved surface The internal angles of triangles always add to more than 180 degrees So if we go to brilliant sight the secret to a problem like this Where you have to find the sum of all interior angles is that longitudinal lines are always perpendicular to the equator Which is why they appear parallel at least when they're very close then since they meet at the top you have a triangle whose angles will definitely be greater tha
derma rpx cream n 180 and that excess will depend on That top angle in this case Negatively curved surfaces on the other hand have internal angles that sum to less than 180 Which means if we want to see whether our universe is open closed or flat aka doesn't have negative positive or zero curvature we could make a big triangle and measure the internal angle since that directly relates to that intrinsic curvature of our universe and scientists have done this before by looking at the Cosmic Microwave Background
https://mumybuzz.com/derma-rpx-cream/
