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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.


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[此贴子已经被作者于2004-12-5 19:23:11编辑过]
发贴IP已设置保密 2004-12-05 19:05
       

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