4.2. In Problems 2.4 and 2.5 we had \"surfaces\" with $K = -1$. Suppose $y$ is a geodesic triangle in either of these cases. What can you say about the sum of the interior angles? (Hint: Example 4.5.)
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5, we considered a geodesic triangle on a surface with constant curvature K=-1, which was a hyperbolic plane. Show more…
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