標準位置角
為了將三角比從銳角推廣到任意大小且有方向性的一般角，必須以一種約定的方式，將角安置在坐標平面上。如果想要有系統地觀看教學視頻，請看單維彰教授之 ShannMath 頻道的所有播放清單，本視頻屬於《基礎數學》清單。https://goo.gl/zjg7wV （此視頻製作於 2015 年 7 月，後製未盡理想而未上傳，後來放棄修訂而公布目前的成品。）
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