This link has been bookmarked by 100 people . It was first bookmarked on 03 Dec 2007, by Colton Telford.
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msjwright2Requires only elementary geometry (triangle angle sum theorem, etc.) but is very challenging. I have not solved this yet. The hints are not spoilers at all.
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19 Nov 13
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28 Mar 13
Kristina BarnabyHere is the "hardest easy geometry problem." It will take a few days to figure it out -- if you are successful.
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18 Dec 12
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Jorge VargasSitio en Inglés. Propone problemas difíciles de geometría con algunas indicaciones.
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ary 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 trigonomery, such as sines and cosines, the law of sines, the law of cosines, etc. There is a review of elementary geometry below.
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.
Here is a very small hint. Here is a small hint. These hints are not spoilers.
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13 Oct 11
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Warren BeckwithTwo proofs using congruent triangles and basic angle facts.
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24 Nov 08
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05 Apr 08
David LawrenceUsing only elementary geometry, determine angle x. Provide a step-by-step proof.
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. There is a review of elementary geometry below.
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. -
02 Apr 08
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Megan Hayes-GoldingUsing only elementary geometry, solve these two problems. Beware -- they are a challenge despite requiring only high school geometry knowledge.
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14 Dec 07
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04 Dec 07
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03 Dec 07
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13 Sep 07
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