The Bear (3)

Where does the bear came from ?

From the North pole !

because we are working in spherical (elliptic) geometry, the sum of angles of a triangle is > 180

And because the bear left from the North Pole, He is White ! Eureka !

Not bad, but there still exist another double infinity of solutions (place where the Bear could have left from) ... Answer next ...

But first, think about what is a triangle and especially on a sphere ?

What about special cases of triangle in the plane, and then what could be a special one a sphere ?

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