Xiangdang gave correct value, but used a wrong graph in his explanation, which was corrected by LiLi (should be 40.17 cm).
Top one of the following graphs should be able to explain the correct answer of this question, and the central one should result in LiLi's answer, and the bottom one is the intuition.
(The point of this question is at that intuition of a distance in "curved" space may fool you)www.ddhw.com
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
雷达卡
发表于 2009-3-7 04:22:00
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