MATH 4250/6250, Problem Set 14, due Thursday, April 30, 2009

A. Problems from Oprea: (6.1.5), (6.1.9), (6.2.1), (6.3.3)

B. Check that the angle excess formula for a sphere (Example 6.5.9) holds for all geodesic triangles (triangles whose sides are geodesic segments) that have one vertex at the north pole and two vertices on the equator.