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Let's Talk About Triangles

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Carl-E:
Best counter example woul be a triangle that has one edge as the equator, and the other two runing to one of the poles (north ot south, doesn't matter). 

the two angles at the equator are both 90 degrees, and the angle at the pole can be anything up to 180, so the three angles can add up to anywhere from 180 to 360. 

As Skewbrow says, that's only on a curved surface, where the straight lines (like the equator) are actually curved.  In a plane, it's always 180 (aka pi). 

jwhouk:
...but that's not called a triangle.

celticgeek:
Maybe it is the Bermuda Triangle, if it is positioned right.

Zingoleb:
Yeah, Carl, that's not a triangle! What do you think you are, some kind of teacher?

Skewbrow:
In spherical geometry that is called a triangle. To go for something perverse, we can also (in the same way) call the exterior of the triangle described by Carl-E also a triangle. It has 3 angles, 270 degrees each :evil:

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