In the figure, what is the value of angle x? This problem is known as Langley’s Adventitious Angles. It is also known as the hardest easy geometry problem because it can be solved by elementary methods but it is notoriously difficult to work out. Can you figure it out? The video presents a solution to this tricky geometry problem.
*At 5:04 I misspoke. I meant BG = BF. We wil shortly prove BG = GF.
Wikipedia entry https://en.wikipedia.org/wiki/Langley%E2%80%99s_Adventitious_Angles
Math with Bad Drawings Solution
World’s hardest easy geometry problem
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