(Solved): a. Any exterior angle of a triangle is greater than each of the opposite interior angles. Warning: ...

a. Any exterior angle of a triangle is greater than each of the opposite interior angles. Warning: Euclid's EAT is not the same as the Exterior Angle Theorem usually studied in high school. Chapter 8 Parallel Transport 112 b. When is EEAT true on the plane, on a sphere, and on a hyperbolic plane?