题目内容
（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:
略
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:略
练习册系列答案
相关题目
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（ ）