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沒有圖,怎麼知道哪裡是角1角2還有D點呀? 證明 角FAC=角ADC+角ACD 由於AD=AC,則角ADC=角ACD 於是角FAC=2倍的角ADC 由於角FAC=2倍的角2 則角2=角ADC,AE//DC.
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