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在学习两点间球面距时,老师说球面上两点间的最短连线,是过这两点的某条劣弧(包括半圆),而且是过这两点的大圆上的劣弧,而不是过这两点的小圆上的劣弧.下面我以图1扇形对这个结论进行证明.不难发现弦长AB是个定长,设为l.又设球面上过A、B两点的任意两个圆的半径分别为r1,r2,对应的圆心角分别为
When learning the spherical distance between two points, the teacher said that the shortest line between the two points on the sphere is a minor arc (including a semicircle) that passes through these two points, and is a minor arc on the great circle that passes these two points. It is not a bad arc on the small circle of these two points. Below I prove this conclusion with a fan of Figure 1. It is not difficult to find that the chord length AB is a fixed length and is set to l. In addition, the radius of any two circles passing A and B on the sphere is respectively r1 and r2, and the corresponding central angles are respectively