解题思路:
由
AC
=
B
D
知,
OC
=
O
D
,可得
△
OAD
≌
△
OBC
,即可证得
AD
=
B
C
.
试题解析:
证明:
∵
O
A
=
O
B
,
AC
=
B
D
,
∴
O
C
=
O
D
.
又
∵
∠
C
OB
=
∠
DOA
,
OA
=
O
B
,
∴
△
OAD
≌
△
OBC
,
∴
A
D
=
B
C
.
详见解析.
解题思路:
由
AC
=
B
D
知,
OC
=
O
D
,可得
△
OAD
≌
△
OBC
,即可证得
AD
=
B
C
.
试题解析:
证明:
∵
O
A
=
O
B
,
AC
=
B
D
,
∴
O
C
=
O
D
.
又
∵
∠
C
OB
=
∠
DOA
,
OA
=
O
B
,
∴
△
OAD
≌
△
OBC
,
∴
A
D
=
B
C
.
详见解析.