（8分）如图，E、F是□ABCD对角线
上的两点，且
.
求证：（1）
；
（2）
.
证明：（1）
四边形
是平行四边形，
.
.················································································· 2分
，
.
.·················································································· 3分
········································································ 4分
(2)由得
.，·········································································· 5分
四边形
是平行四边形. ·································································· 7分. 8分
解析
科目：初中数学 来源： 题型：
查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
20、已知：如图，E、F是AB上的两点，AE=BF，AC∥BD，∠C=∠D．求证：CF=DE．
（2013•荣昌县模拟）如图，⊙O的直径是AB，∠C=35°，则∠DAB的度数是（ ）