如图,
、
分别是边长
为的等边
的边
,
上的动点,点
从顶点
,点
从顶点
同时出发,分别沿
,
边运动,点
到点
停止,点
到点
停止.社运动时间为
秒,他们的速度都为
.
![](https://img.xkw.com/dksih/QBM/2019/11/29/2344270368989184/2345138960613376/STEM/469070fb485040239fc08e4fba7900dd.png?resizew=111)
(1)连接
,
相交于
,在点
,
的运动过程中
的大小是否变化?若变化,说明理由;若不变,求出它的度数;
(2)当
取何值时,
是直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244ea6a312d4b6831a6b833ea3f4fcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3683bae59bc5de0cccc8011815c327.png)
![](https://img.xkw.com/dksih/QBM/2019/11/29/2344270368989184/2345138960613376/STEM/469070fb485040239fc08e4fba7900dd.png?resizew=111)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9baba5742fe32111ddd8a76fd5b265.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333a89e8227c1f57313897d4424d04f0.png)
更新时间:2019-11-30 17:40:20
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知△ABC是等边三角形,AB=8,M为AC中点,D为BC边上一动点,将AD绕点A逆时针旋转60°得到AE,连接CE、DE、ME.
(1)求证:CD+CE=CA;
(2)求出点M到CE所在直线的距离;
(3)当ME=
时,求CE的值.
(1)求证:CD+CE=CA;
(2)求出点M到CE所在直线的距离;
(3)当ME=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec85f29c0860b57a8f0cf8098c13a97e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/3/857c288b-3c81-4c0f-8e25-5f29aff9a785.png?resizew=171)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是等边三角形,点E在直线BC上,点F在直线AB上(点E、F不与三角形的顶点重合),
,连接CF和AE,将线段CF绕点C顺时针旋转
得到线段CG,连接AG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/bd723998-ff5a-4475-a17d-e68edddd4010.png?resizew=393)
(1)如图1,当点E与点F分别在线段BC与线段AB上时.
①求证:
;
②求证:四边形AECG是平行四边形;
(2)如图2,当点E与点F分别在线段CB与线段BA的延长线上时,请判断四边形AECG还是平行四边形吗?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/bd723998-ff5a-4475-a17d-e68edddd4010.png?resizew=393)
(1)如图1,当点E与点F分别在线段BC与线段AB上时.
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
②求证:四边形AECG是平行四边形;
(2)如图2,当点E与点F分别在线段CB与线段BA的延长线上时,请判断四边形AECG还是平行四边形吗?并说明理由.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是等边三角形,点
分别在边
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0db7828e-d99b-4da4-b84b-2ab616d213ae.png?resizew=148)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0175d8a8ffcea569a8421c95c1dad2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/0db7828e-d99b-4da4-b84b-2ab616d213ae.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83690da7c2883d914310c3f5a28bab41.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697aac12f407724328d1563ce9936358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次