如图,在平行四边形ABCD中,对角线AC,BD相交于点O,且OA=OD,∠OAD=50°.求∠OAB的度数.
18-19八年级下·山东德州·期中 查看更多[6]
更新时间:2019-05-14 10:37:58
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解答题-证明题
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适中
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【推荐1】如图,在
中,过点A作
,垂足为E,连接
,F为线段
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/eb1fea0e-0eec-4fe0-8d5a-a98b132ebaab.png?resizew=196)
(1)求证:
:
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4908c742e58c66ed0feb53a29b0dc20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/eb1fea0e-0eec-4fe0-8d5a-a98b132ebaab.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b35ead4a9102cdebc62499ada700e36.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4187a861d1c558ee70701fc501f58842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在□ABCD中,E是AB的中点,ED和AC相交于点F,过点F作FG∥AB,交AD于点G.
![](https://img.xkw.com/dksih/QBM/2014/3/17/1573715419947008/1573715425935360/STEM/88dbd72b202c422a9d598fdb3b9f6fe6.png)
(1)求证:AB=3FG;
(2)若AB:AC=
:
,求证:
.
![](https://img.xkw.com/dksih/QBM/2014/3/17/1573715419947008/1573715425935360/STEM/88dbd72b202c422a9d598fdb3b9f6fe6.png)
(1)求证:AB=3FG;
(2)若AB:AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b817fec27270a7cd90cb324a57a3d30.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐1】如图,等边
的顶点
,
在
轴上,点
在
轴上,点
为直线
上一动点,连接
,以
为一边在
的右侧作等边
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/80fdb303-8471-4dcd-b61f-6c7d295913ef.png?resizew=236)
(1)求证:
;
(2)判断
与
轴的位置关系,并说明理由;
(3)点
运动过程中,请直接写出当
与
满足怎样的数量关系时,
是直角三角形?无需说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/80fdb303-8471-4dcd-b61f-6c7d295913ef.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】平行四边形ABCD的对角线AC,BD相交于点O,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c6e55dfe-9216-4665-93c0-45b825e699a7.png?resizew=187)
求证:四边形ABCD是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d328b02462aa25a936d1c83eee4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c6e55dfe-9216-4665-93c0-45b825e699a7.png?resizew=187)
求证:四边形ABCD是菱形.
您最近一年使用:0次