1) 连EM,过D作AC的平行线,交ME于F,等腰三角形三线合一,所以F是ME中点,D是MC中点
2)如图连线,作DG//AC,因此G也是AF的中点,DG也是EM的中垂线,又AFM是直角三角形,所以GE=GM=AG=GF,所以AEMF四点共圆, 角AEF=角AMF=90度
1) 连EM,过D作AC的平行线,交ME于F,等腰三角形三线合一,所以F是ME中点,D是MC中点
2)如图连线,作DG//AC,因此G也是AF的中点,DG也是EM的中垂线,又AFM是直角三角形,所以GE=GM=AG=GF,所以AEMF四点共圆, 角AEF=角AMF=90度
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高!去北大还是清华?
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04/13/2024 postreply
16:33:25
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