海龍公式是什麼？三角形面積還能這樣算！｜#數學3乘3 ｜曉戴數學｜高中三角函數
Synopsis
在小學就學過三角形面積叫做底乘高除2，到高中告訴你可以用1/2*ab sinC 而這個式子經過sin跟cos的平方轉換以及餘弦定理改寫後 ...
![[高中數學][高一下][三角函數] EP18.2 三角形面積(海龍公式) [楊翰數學]](https://i.ytimg.com/vi/T_eIuotgX6M/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLBVGo1xdY-NB2hE_Apdpec-atSaFA)
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