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延長FD於H,使HD=BE,連接AH,則很容易證得AH=AE,三角形AHD的面積等於三角形ABE的面積,因為角EAF=45度,則容易證得角HAF=45度,所以三角形AEF與三角形AHF全等,即面積也相等,
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