James Burkett Hartle, Gravity: An Introduction to Einstein's General Relativity, 2nd edition

Chapter 2. Geometry as Physics 제2장. 물리학으로서의 기하학

문제(Problem) 3 및 해설(Solution)

(a) Verify the relation (2.4) between the sum of the interior angles of a spherical triangle and its area when two of the angles are right angles.

(b) Prove the relation generally.

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