1 . 如图,点O是边长为
的等边△ABC的内心,将△OBC绕点O逆时针旋转30°得到△OB1C1,B1C1交BC于点D,B1C1交AC于点E,则DE的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/e1248aa2-4154-46e8-870a-b83dda9ed802.png?resizew=152)
A.2 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 如图,
中,
,
于点
,
,
是线段
上的一个动点,则
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f020051f12188f88c4ab785234f60bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65363d912d8dae2cdcc9cfe121205c81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/abf0275f-9d3b-4795-8ae4-54cf4cfde07b.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 如图,四边形
是矩形,点
是
延长线一点,连接
,
垂直平分
,垂足为
,点
在
上,点
在
上,且
.
(1)若
,
,求
;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75bcd26bc9e85cdae1a06ecd1a65643f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/6f323c81-14dc-489d-b686-325565af7ada.png?resizew=147)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766b51dbdec21ce16d595c0594dcf219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd495843817029d40bd4064f738a332f.png)
您最近一年使用:0次
4 . 如图①②,
和
均为直角三角形,
,
,
,点C在边EF的延长线上,
,射线EM与AD交于点M,
(
).
(1)如图①,当点B落在射线EF上时,EM与BA的延长线相交于点G,则
______.
(2)如图②,把
绕点C逆时针旋转
度(
),
的值是否保持不变?请仅就图②给出你的证明.
(3)若
,在
绕点C旋转过程中,直接写出线段AD的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888b5145b9728b225835c523bf73364a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32716ed45e699372783d4401da03312a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61684617e0c137f27903c2047725a9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04be7fd3461446d511fe2d09fc385e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4dfa72b76f576f6b620db7d001d839b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/780341fd-8660-4f97-94c7-ef5ae2779095.png?resizew=390)
(1)如图①,当点B落在射线EF上时,EM与BA的延长线相交于点G,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e0bba6852d7493351a2d779f3f6218.png)
(2)如图②,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfbe55f659e4b597bb81680b20db4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c0b95cba2060e4b07283a6b710ff8a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c782918ad76078ab6652d73fd0bf6bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
5 . 刘老师在“矩形的折叠”活动课上引导学生对矩形纸片进行折叠.
如图,将矩形纸片
折叠,点
与点
重合,点
与点
重合,将纸片展开,折痕为
,在
边上找一点
,沿
将
折叠,得到
,点
的对应点为点
.
(1)问题提出:若点
落在
上,
,连接
.
①
是______三角形;
②若
是等边三角形,则
的长为______.
(2)深入探究:在(1)的条件下,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
时,判断
的形状并证明;
(3)拓展延伸:若
,
,其他条件不变,当点
落在矩形
内部
包括边
时,连接
,直接写出
的取值范围.
如图,将矩形纸片
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/cea982ae-e18f-4e8b-bcbd-cf68b5f40219.png?resizew=133)
(1)问题提出:若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)深入探究:在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec26d81361e13a37bcf3c95db0ee89b6.png)
(3)拓展延伸:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
您最近一年使用:0次
6 . 如图,在矩形ABCD中,点E,F分别在边AB,BC上,且AE=
AB,将矩形沿直线EF折叠,点B恰好落在AD边上的点P处,连接BP交EF于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/b3841838-195d-445d-b7e4-a26188bf57be.png?resizew=149)
(1)求∠ABP的度数;
(2)求
的值;
(3)若CD边上有且只有2个点G,使△GPD与△GFC相似,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/b3841838-195d-445d-b7e4-a26188bf57be.png?resizew=149)
(1)求∠ABP的度数;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b957cd661df6b6d5e634fb4dfdd1e5.png)
(3)若CD边上有且只有2个点G,使△GPD与△GFC相似,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5509269c540ac83ba34d2e8a31242903.png)
您最近一年使用:0次
7 . 如图,等边△ABC中,AB=2,点D是以A为圆心,半径为1的圆上一动点,连接CD,取CD的中点E,连接BE,则线段BE的最大值与最小值之和为________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/6d969f70-3b25-4762-a886-eef0faf81a49.png?resizew=107)
您最近一年使用:0次
8 . 如图,在正方形
中,
,点E在边
上,且
,将
沿
对折至
,延长
交边
于点G,连接
,则下列结论:①
;②
;③
;④
;⑤
.其中正确的是_________ (填序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7920c260a4793cb02b78dabe2d817d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508ce93fc1a749f4d608a4b2664f8859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0e2233a5e812e006e037a1533d5dc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc08baf67044328fb366669a454826a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278300add1fd1505b59306e4c705e8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5732194a633218543d5365c31a910ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9489e12b29b06161d31e60568a6ce63.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/81203d68-0bc3-48d5-ab46-413be6008a34.png?resizew=155)
您最近一年使用:0次
9 . 如图,扇形
的半径为1,圆心角是90°.点
是
上一动点,
于点
,
于点
,点
、
、
、
分别是线段
、
、
、
的中点,
与
相交于点
,
与
相交于点
.
(1)求证:四边形
是平行四边形;
(2)探索当
的长为何值时,四边形
是矩形;
(3)连结
,试说明
是定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e17dc84ba2e871aeb3a3fd2a2b5f1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84441c70564cd068d2668085957c3fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee9d78e5383cd018ba74d911c9976bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/c75e3040-f073-4a63-8714-ab42ba86db6c.png?resizew=164)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fafaec5283b313a43ab0502280799c.png)
(2)探索当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2fafaec5283b313a43ab0502280799c.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb43fd99a100d46d7feecb3edc6397ea.png)
您最近一年使用:0次
10 . 如图(1),抛物线
经过
,
两点,并与直线
(
为常数,且
)交于
、
两点,直线
过点
且平行于
轴,过
、
两点分别作直线
的垂线,垂足分别为点
、
.
(1)求此抛物线的解析式;
(2)猜想与证明:
①
______
______
(填“>”“<”或“=”)
②
为______三角形(填“锐角”、“直角”或“钝角”)并证明你的猜想
(3)如图(2)点
为坐标平面内一点,点
是抛物线上任意一点,求
周长最小值,并求出此时
点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e335fecc2105f095fe41e8739db935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238f0ea276a00ae8d681ce00cc11c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaef66a0582e95fb5c57a405acdea9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35bf8c29fc8004451de66e12b4de9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/12c91dec-63b2-4907-b4ec-b41b9b0a5f64.png?resizew=176)
(1)求此抛物线的解析式;
(2)猜想与证明:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
(3)如图(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48eced443f5b969c6be558849c7bd8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ab141e7a809aa0f7f46c9df9de2b0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/c30b9589-f196-4fe9-a412-6beaac51879c.png?resizew=175)
您最近一年使用:0次