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原帖由 風之男 於 2021-1-29 07:56 PM 發表 This is one way to do it: https://imgur.com/a/EvgSx30 There might be other ways, I'll try to look for them. Interesting tidbit: Length of CM (half of what we're required to calculate), (1+sqrt5) ...
原帖由 見習天使 於 2021-2-1 12:24 PM 發表 好熟面口,樓主尼本係咪朗文個本?我都唔係好識>
原帖由 風之男 於 2021-2-3 04:22 AM 發表 So there's another way, although it's kind of cheating. You can redraw the figure (or even, use the figure given, because it can't not be in scale in this particular question), and you'd find out A ...