James Burkett Hartle, Gravity: An Introduction to Einstein's General Relativity, 2nd edition
Chapter 2. Geometry as Physics 제2장. 물리학으로서의 기하학
문제(Problem) 6 및 해설(Solution)
Consider a sphere of radius a and on it a segment of length s of a line of latitude that is a distance d from the North Pole measured on the sphere. What is the angle between the lines of longitude that his segment spans? Is this angle greater or smaller than the angle the segment would subtend at the same distance on a flat plane?
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