四边形
是由等边
和顶角为120°的等腰三角形
拼成,将一个60°角顶点放在点
处,60°角两边分别交直线
于
,交直线
于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/66099948-2b62-4bca-aee1-29b52d1cf24e.png?resizew=367)
(1)当
都在线段
上时,探究
之间的数量关系,并证明你的结论;
(2)当
在边
的延长线上时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b92dbe7d01d47d6c2db1396180caf76d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/66099948-2b62-4bca-aee1-29b52d1cf24e.png?resizew=367)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d86c22926aef98a11eea7ed666f26259.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6086ee032330468b9eb15e7b2b08e6.png)
更新时间:2020-02-28 22:17:06
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知四边形
中,
,
,
,
,
,将
绕点
旋转,它的两边分别交边
、
(或它们的延长线)于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/779f2b70-39f3-49f6-b0a0-7cf60c6a4854.png?resizew=355)
(1)当
绕点
旋转到
时(如图1),
①求证:
;
②求证:
;
(2)当
绕点
旋转到如图2所示的位置时,
,此时,(1)中的两个结论是否还成立?请直接回答.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2449b6be64417beea30528886720c20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/779f2b70-39f3-49f6-b0a0-7cf60c6a4854.png?resizew=355)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de4e348f942d754a2b8f94084293fc2.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afb5e71726d0a4a358ff9f6e31696c4.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d9f2b82b73e7a0917a19f74dbc5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672933164bdc7cc1a4fc5441c7f4b193.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】已知,等边△ABC,点 E 在 BA 的延长线上,点 D 在 BC 上,且 ED=EC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/acd81683-3e6b-4630-80d3-0f6f0963d477.png?resizew=256)
(1)如图 1,求证:AE=DB;
(2)如图 2,将△BCE 绕点 C 顺时针旋转 60°至△ACF(点 B、E 的对应点分别为点 A、F),连接 EF.在不添加任何辅助线的情况下,请直接写出图中四对线段,使每对线段长度之差等于 AB 的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/acd81683-3e6b-4630-80d3-0f6f0963d477.png?resizew=256)
(1)如图 1,求证:AE=DB;
(2)如图 2,将△BCE 绕点 C 顺时针旋转 60°至△ACF(点 B、E 的对应点分别为点 A、F),连接 EF.在不添加任何辅助线的情况下,请直接写出图中四对线段,使每对线段长度之差等于 AB 的长.
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在△ABC中,以AB为直径的⊙O交AC于点E,交BC于D,延长BE到F,使BF=AC,连接FC.
(1)若AD=BC,求证:FC=CD,FC⊥CD;
(2)连接OD,OE,若四边形OECD是平行四边形,则:
①∠ACB= °;
②当AB=4时,四边形OECD的面积为 .
(1)若AD=BC,求证:FC=CD,FC⊥CD;
(2)连接OD,OE,若四边形OECD是平行四边形,则:
①∠ACB= °;
②当AB=4时,四边形OECD的面积为 .
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586307762651136/2590542480490496/STEM/759cb028d926408fbd98831b93b687fe.png?resizew=147)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,等边
中,点
在
上,点
在
上,
,
与
相交于点
.
(1)求证:
;
(2)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024015816ece1fd176186ed0f04db8f9.png)
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639426616172544/2646803133784064/STEM/dd4e73d5-1ecb-4bd7-a85f-b3e6d5b2357f.png)
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解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,点P是正方形ABCD边AB上一点(不与点A.B重合),连接PD并将线段PD绕点P顺时针方向旋转90°得到线段PE, PE交边BC于点F.连接BE、DF.
![](https://img.xkw.com/dksih/QBM/2011/7/7/1573222035718144/1573222113214464/STEM/a64e8933-e383-4c4f-b705-bcc6c431ea08.png)
(1)求证:∠ADP=∠EPB;
(2)求∠CBE的度数;
(3)当
的值等于多少时.△PFD∽△BFP?并说明理由.
![](https://img.xkw.com/dksih/QBM/2011/7/7/1573222035718144/1573222113214464/STEM/a64e8933-e383-4c4f-b705-bcc6c431ea08.png)
(1)求证:∠ADP=∠EPB;
(2)求∠CBE的度数;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab40260ac9056153d14d70d2519371.png)
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解答题-问答题
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【推荐2】如图,平面直角坐标系中,点O是坐标原点,
是等边三角形,点A的坐标为
,将
绕着点A顺时针旋转
,得到
.
(2)连接
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
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