Help me to understand an interesting geometry solution

Revision en1, by Least_but_not_the_last, 2017-08-11 09:04:34

problem: https://toph.co/p/problem-number-nine-and-three-quarter solution: http://ideone.com/RYkF3m

though I solved it in two different ways. but I can't understand this solution. I tried but couldn't make a communication with the actual writer of the solution. Please help me.

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en1 English Least_but_not_the_last 2017-08-11 09:04:34 335 Initial revision (published)