Points c,a,b are connected to form a triangle along the surface of a sphere. Points R,E,N are connected to form a triangle on a euclidean.
What is true between spherical and euclidean geometry?

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  1. holy smoke! Where to start?

    The angles on a spherical triangle sum to more than 180, vs 180 in the plane.

    pick up any text on spherical trig and you can easily list a dozen things right off the bat.

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