定义:有且仅有一组对角相等的凸四边形叫做“准平行四边形”,例如,凸四边形
中,若
,
,则称四边形
为准平行四边形.如图;
、
、
、
是
上的四个点,延长
到
,使
.已知
,求证:四边形
是准平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520d831f0b99a1698f06775cc2047390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045b85674bbe01e477c76501affed905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4d511f8cec522b68caf4ad99f7a592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ba22b69231ffb2878458c15c51bd90.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/41115a35-725e-4410-abea-1d593a1bfd91.png?resizew=140)
22-23九年级上·山西阳泉·期末 查看更多[2]
更新时间:2023-02-24 13:26:23
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相似题推荐
解答题-问答题
|
较易
(0.85)
名校
【推荐2】如图,在
中,
,点
在
边上,点
在
边上,连接
,
.已知
,
.
(1)
与
全等吗?为什么?
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757702710853632/2822705076158464/STEM/490f65e5-3f34-44fd-b19b-4814dfa2f468.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】如图,四边形
内接于
,且
的半径为r,
.
(1)若
,求
的长.
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1de1496a1b68cb1e3bb313427ddba9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/1/e8b02044-962e-49b2-ac2a-95943372dd56.png?resizew=123)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8176754726d2194c890e80df1a1f1c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5276c294388c59057b24a500fe0a82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19517693ebbcf16cc9a10c2a13795b6.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,AB是⊙O的直径,AC、BC分别交⊙O于点D、E,连DE,AD=BE.
求证:
(1)DE∥AB;
(2)DC=EC.
求证:
(1)DE∥AB;
(2)DC=EC.
![](https://img.xkw.com/dksih/QBM/2021/11/13/2850642599993344/2851265403625472/STEM/8cb0f855-e569-4748-8d50-306e959ce25c.png?resizew=202)
您最近一年使用:0次