(因為等邊三角形是特殊的等腰三角形)粉絲解法1:粉絲解法2:以AC為邊向外作等邊△ACF,連線DF∵∠BAC=20°∴∠DAF=80°在△ACB和△FAD中BC=AD, ∠ACB=∠DAF,AC=AF∴△ACB≌△FAD(SAS)∴∠AFD...
Read more(因為等邊三角形是特殊的等腰三角形)粉絲解法1:粉絲解法2:以AC為邊向外作等邊△ACF,連線DF∵∠BAC=20°∴∠DAF=80°在△ACB和△FAD中BC=AD, ∠ACB=∠DAF,AC=AF∴△ACB≌△FAD(SAS)∴∠AFD...
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