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由 **aaddfg** 於星期五七月 28, 2006 1:47 pm

圓內接四邊形外角=內對角(對角互補)
AEBD是圓內接四邊形
故角AEB+角ADB=180
角AEB+角CEB=180
所以角ADB=角CEB

由 **tangpakchiu** 於星期五七月 28, 2006 1:26 pm

#ed_op#DIV#ed_cl#想問問jackhoung，為什麼角CEB=角ADB???#ed_op#/DIV#ed_cl#

由 **jackhoung** 於星期五七月 28, 2006 12:58 pm

#ed_op#DIV#ed_cl#連接BE,BC,BF,BD#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#則角CEB=角ADB#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#角DFB=角ACB#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#又BC=BF#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#所以#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#ΔCEB全等於ΔFDB#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#DIV#ed_cl#所以CE=DF#ed_op#/DIV#ed_cl##ed_op#/DIV#ed_cl#

由 **tangpakchiu** 於星期五七月 28, 2006 10:18 am

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[quote="tangpakchiu"]#ed_op#DIV#ed_cl##ed_op#IMG alt="image file name: 2k11bbe44982.gif" src="http://yll.loxa.edu.tw/phpBB2/richedit/upload/2k11bbe44982.gif" border=0#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SPAN style="FONT-FAMILY: 新細明體; mso-font-kerning: 0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 新細明體"#ed_cl#⊙#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-FAMILY: 新細明體; mso-font-kerning: 0pt; mso-bidi-font-family: 新細明體"#ed_cl#O1#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-FAMILY: 新細明體; mso-font-kerning: 0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 新細明體"#ed_cl#與⊙#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-FAMILY: 新細明體; mso-font-kerning: 0pt; mso-bidi-font-family: 新細明體"#ed_cl#O2#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-FAMILY: 新細明體; mso-font-kerning: 0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; 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