help in a Geometry Problem

Revision en4, by _QWOiNYUIVMPFSBKLiGSMAP_, 2018-05-27 21:45:21

Could any one explain to me the solution of this problem ?

http://codeforces.net/contest/248/problem/C

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en4 English _QWOiNYUIVMPFSBKLiGSMAP_ 2018-05-27 21:45:21 2 Tiny change: 'roblem ?\nhttp://c' -> 'roblem ?\n\nhttp://c'
en3 English _QWOiNYUIVMPFSBKLiGSMAP_ 2018-05-26 21:33:29 2 Tiny change: 'roblem ?\n\nhttp://c' -> 'roblem ?\nhttp://c'
en2 English _QWOiNYUIVMPFSBKLiGSMAP_ 2018-05-26 04:43:26 2 Tiny change: 'roblem ?\nhttp://c' -> 'roblem ?\n\nhttp://c'
en1 English _QWOiNYUIVMPFSBKLiGSMAP_ 2018-05-25 07:49:31 131 Initial revision (published)