✨ Best Answer ✨
AB = AD
BC = BE
∠ABC = ∠DBE
⇒ △ABC ≅ △DBE (SAS全等)
如圖
橘黃色：對應角相等
粉紅色：對頂角相等
得出上面的藍色也是50°
最後得到紅色 180° - 50° = 130°
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速解
首先還是要看出全等關係
因為新的三角形就是
舊的三角形旋轉50°
也可以找出最後的夾角