(8分)如圖,E、F是□ABCD對(duì)角線上的兩點(diǎn),且.
求證:(1);
(2).
證明:(1)四邊形是平行四邊形,
.
.················································································· 2分
,
.
.·················································································· 3分
········································································ 4分
(2)由得
.,·········································································· 5分
四邊形是平行四邊形. ·································································· 7分
. 8分
解析
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