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problem of the week journal entry worlds hardest easy geometry problem.notebook January 16, 2013 World's Hardest Easy Geometry Problem Using only elementary geometry, determine angle x. Provide a stepbystep proof. You may use only elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (sideangleside, etc.). You may not use trigonometry, 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. Jan 912:18 PM 1