Quod Erat Demonstrandum

2015/05/20

幾何老題

Filed under: Fun — johnmayhk @ 1:40 下午
Tags: ,

那天在校開會途中,傳來舊同學的 whatsapp,原來是一個幾何問題:

johnmayhk-concurrent-chords
x 的大小。(圖有誤,\angle ACD=30^o,非 60^o

那應是經典題,以前寫文時引過這例,見:

https://dl.dropboxusercontent.com/u/19150457/SFXC/johnmayhk-concurrent-chords.doc

之後舊同學也引了連結:

https://www.duckware.com/tech/worldshardesteasygeometryproblem.html

補充返幾何證明,美妙!

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