1) 連EM,過D作AC的平行線,交ME於F,等腰三角形三線合一,所以F是ME中點,D是MC中點
2)如圖連線,作DG//AC,因此G也是AF的中點,DG也是EM的中垂線,又AFM是直角三角形,所以GE=GM=AG=GF,所以AEMF四點共圓, 角AEF=角AMF=90度
1) 連EM,過D作AC的平行線,交ME於F,等腰三角形三線合一,所以F是ME中點,D是MC中點
2)如圖連線,作DG//AC,因此G也是AF的中點,DG也是EM的中垂線,又AFM是直角三角形,所以GE=GM=AG=GF,所以AEMF四點共圓, 角AEF=角AMF=90度
• 高!去北大還是清華? -wxcfan123- ♂ (0 bytes) () 04/13/2024 postreply 16:33:25
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