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[數學]幾何題
由 kai 於 星期日 四月 30, 2006 12:06 pm
#ed_op#DIV#ed_cl#五邊形ABCDE#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#角B=角E=90#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#角DAE=角BAC#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#BD，CE交於O#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#求證AO⊥BE#ed_op#/DIV#ed_cl#