如图,在等边三角形
中,点
为
上的一点,过点
作
的平行线
交
于点
,点
是线段
上的动点(点
不与
、
重合).将
绕点
逆时针方向旋转
,得到
,连接
、
,
交
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/eef54542-2b67-4aae-816c-799f04cfb90e.png?resizew=298)
(1)
与
是否相似?说明理由.
(2)证明:在点
的运动过程中,总有
.
(3)当
为何值时,
是直角三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/e6e490f703eb6c9bb1278c78ebc2d661.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1eda00fc2d64ce3a42004b24adf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/eef54542-2b67-4aae-816c-799f04cfb90e.png?resizew=298)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)证明:在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0173b71f2f3fcf8e8a43d9d20f091d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a6c954d550a84718a455e4f890b474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9b0b5905405982c227e1343997abc5.png)
更新时间:2023-12-29 15:51:25
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
、
分别是
、
的中点,
,过点
作
交
的延长线于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/0cb3b415-0c3b-4843-af3f-36df295a76d6.png?resizew=161)
(1)求证:四边形
是菱形;
(2)若
,
,求菱形
的面积.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa03fe455c3c777f1a200cb6967e469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d5e4889eecada5e0469c7834ee06ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/0cb3b415-0c3b-4843-af3f-36df295a76d6.png?resizew=161)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968c8274a7584778d0e228acd9064263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在△OAB和△OCD中,OA=OB,OC=OD,∠AOB=∠COD=90°,连接AC,BD交于点M,OA与BD交于点E.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923442063335424/2924211438641152/STEM/96cded30-73c2-4166-9800-4551cb223be0.png?resizew=275)
(1)如图1,①求证:AC=BD;②求证:AC⊥BD;
(2)如图2,若OD//AB,M为AC的中点,求∠OAC的度数.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923442063335424/2924211438641152/STEM/96cded30-73c2-4166-9800-4551cb223be0.png?resizew=275)
(1)如图1,①求证:AC=BD;②求证:AC⊥BD;
(2)如图2,若OD//AB,M为AC的中点,求∠OAC的度数.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,AB是⊙O的直径,AC是弦,OD⊥AB交AC于点D.若∠A=30°,OD=2.求CD的长.
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407538051883008/2408190626750464/STEM/c762c6f947514f159ce4254bbae12ce5.png?resizew=111)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,AB是⊙O的直径,AC是⊙O的弦,点E是弧AC的中点,连接BE交AC于点F,若AB=5,AC=4,求FC的长.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897681325383680/2956014977638400/STEM/0a76596e-8896-492b-919f-a7f76d454e41.png?resizew=155)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
逆时针旋转到
,其中
,点
在同-直线上.
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294070244663296/2294131396141056/STEM/3cef8c9f5ddb4b21850729e8a8859fa2.png?resizew=148)
(1)旋转中心是哪一点?
(2)旋转了多少度?
(3)指出对应线段、对应角及对应点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92a1b14bfe7fc874e1a98b8cc5f8a22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d322efb382f7cc7a9bb242bcd706d649.png)
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294070244663296/2294131396141056/STEM/3cef8c9f5ddb4b21850729e8a8859fa2.png?resizew=148)
(1)旋转中心是哪一点?
(2)旋转了多少度?
(3)指出对应线段、对应角及对应点.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知
和
,
,
,延长
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/5d9bfd17-2ee8-4ecc-afb4-d9bdfe5df68c.png?resizew=467)
(1)如图1,点D在
外,点E在AB边上时,求证:
;
(2)若将(1)中的
绕点B顺时针旋转,使点E在
的内部,
交
于点O,如图2,则(1)中的结论是否仍然成立?请证明;
(3)若将(1)中的
绕点B顺时针旋转,使点E在
的外部,如图3,请直接写出
的数量关系及位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de36aec23d150489da9166675afc849b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9c9c0d5dc3b7472fa8356addb8369f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab406b15d40cbff39e07a4d253a1f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e35a46dffa7cc4bb78b64f5535a5882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/5d9bfd17-2ee8-4ecc-afb4-d9bdfe5df68c.png?resizew=467)
(1)如图1,点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afed6377999741e859ea48960d0a9593.png)
(2)若将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81777271617980b6cb1338e749984fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81777271617980b6cb1338e749984fe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e48d6dd1f7a8f623ef6402754b0246b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在直角坐标系中,A(4,0),B(8,0),C(0,4).动直线EF(EF∥x轴)从点C出发,以每秒1个单位长度的速度沿y轴负方向平移,且分别交y轴、线段BC于E、F两点,动点P同时从点B出发,在线段OB上以每秒2个单位长度的速度运动至原点O停止,当点P停止时点E也随之停止.
(1)求直线BC的解析式;
(2)是否存在t的值,使得
相似?若存在,试求出t的值,并求出此时
的面积;若不存在,请说明理由;
(3)若将直线CB绕点B顺时针旋转45°得到直线BD,在直线BD上有一动点M,在x轴上有一点N,是否存在点M,N,使得以点C、A、M、N为顶点的四边形为平行四边形,如果存在,请求出点N的坐标;如果不存在,请说明理由.
(1)求直线BC的解析式;
(2)是否存在t的值,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23017f73d3f8dabaacd5933fe2e8a60e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8a8f63088245653535d5d23d6f26a8.png)
(3)若将直线CB绕点B顺时针旋转45°得到直线BD,在直线BD上有一动点M,在x轴上有一点N,是否存在点M,N,使得以点C、A、M、N为顶点的四边形为平行四边形,如果存在,请求出点N的坐标;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/2f7dc2f1-6a03-4985-abc3-d4a6ecc4b806.png?resizew=433)
您最近一年使用:0次