餘弦定理應用：平行四邊形定理、中線定理 - 1
Synopsis
利用補角的特性使用兩次餘弦定理而得到三角形中線與兩邊的關係式。
![[三角函數資優課程下][21/41][平行四邊形定理與三角形中線長公式][02分45秒]](https://i.ytimg.com/vi/js7nHZVP7Aw/hqdefault.jpg?sqp=-oaymwEcCOADEI4CSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLBoa_-2MslZJPmpgfXNt3sKGOJBIw)
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