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垂直關係 按照圖,題目應該是AE平分∠FAB 三角形ABC為等腰三角形,三線合一, AD為中線,也是角平分線所以∠DAB=1/2∠CAB,又∠BAE=1/2 所以∠EAD=1/2(∠CAB+∠FAB)=90
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