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---- World's Hardest Easy Geometry Problem 1 (http://qthome.org/bbs/dispbbs.asp?boardid=5&id=236)
-- 发布时间：12/5/2004 7:05:00 PM
-- World's Hardest Easy Geometry Problem 1
此主题相关图片如下：
Using only elementary geometry, determine angle a.
You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.). You may not use more advanced trigonomery, such as the law of sines, the law of cosines, etc.
This is the hardest problem I have ever seen that is, in a sense, easy. It really can be done using only elementary geometry. This is not a trick question.
Sorry, but I\'m not giving the answer here. You will just have to work on it until you either solve it or are driven insane.
在国外网站上找到的一道趣题，大家看看吧！
-- 发布时间：12/31/2004 5:51:52 PM
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这题我感觉挺好的，没人做一下？
-- 发布时间：1/1/2005 3:10:52 PM
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请问什么算是elementary geometry，什么算是advanced trigonomery？
-- 发布时间：1/9/2005 4:31:41 PM
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用正弦定理与余弦定理.........
-- 发布时间：1/9/2005 5:08:52 PM
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原题说，禁止用advanced trigonomery，例如正弦定理、余弦定理，而且还等等
[此贴子已经被作者于2005-1-9 17:10:24编辑过]
-- 发布时间：1/23/2005 8:21:51 PM
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这题推荐大家看一下，用正余弦定理想必大家都会做，但是只用三角形内角和为180度求解还确实有些困难。
-- 发布时间：1/28/2005 6:56:09 PM
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不好推
-- 发布时间：2/9/2005 5:54:09 PM
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算！
-- 发布时间：5/10/2005 6:37:10 PM
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利用bcd为60做一个正三角形
