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作者 ttwell 在 PTT [ ask ] 看板的留言(推文), 共4則
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9F推: 1.B至中心點線延長交於AC令為D點，另外兩條同樣延長09/22 16:03
10F→: 2.平移BC線至D點，把可以求的角度算一下，可以找到中心角09/22 16:05
11F→: 有8/74/98三個角度，再代入回去就可以算出X=50度了09/22 16:06
12F推: 10/74/96才對，寫錯了@@09/22 16:08
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