VERY HARD South Korean Geometry Problem ( CSAT Exam)
Thanks to Hyeongjun (H. J. ) for emailing me this problem This is a challenging problem from the math section of the 1997 CSAT, a standardized test in South Korea. Can you figure it out It took me several attempts, but it was really satisfying when I solved it (I did need to look up one key insight, which is the first thing presented in the solution). So give it a try, and don t peek at the rest of the solution too early 0:00 Problem 1:58 My many attempts 3:28 Unwrapping a cone 5:14 Solution Coordinate geometry solution and proof of uphill, downhill track
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