以
中AD为直径的
交AE于B、交DE于C,且B为弧AC中心.
(1)判断
形状,并说明理由.
(2)连接BC,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
(2)连接BC,求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c231c1150e27c34eb787a46b02ea8.png)
![](https://img.xkw.com/dksih/QBM/2020/1/6/2371110873088000/2371285473296385/STEM/74830b82-9605-4f74-90e1-77ff6a907048.png)
更新时间:2020-01-06 16:15:33
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在△ABC中,点D、E分别在AB、AC边上,BE与CD相交于点F,且AD=AE,∠1=∠2.求证:∠FBC=∠FCB.
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114469022482432/2117325623336960/STEM/a330f5416c1c47999404df92caa3c19f.png?resizew=97)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】在平面直角坐标系中,
的位置如图所示,
、
、
三点都在格点上.
(1)画出
关于
轴对称的
;
(2)在网格中找出点
,使得以
,
,
三点为顶点的
与
全等,请写出符合条件的所有点
的坐标.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/8/2df19858-d74e-4c82-90cc-f795c6ae6136.png?resizew=213)
(1)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(2)在网格中找出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】【定义】一组邻边相等且对角互补的四边形叫做“等补四边形”.如图1,四边形
中,
,
,则四边形
叫做“等补四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/e5d740d8-6b7b-407a-89b2-973d21c49056.png?resizew=359)
(1)【概念理解】在以下四种图形中,一定是“等补四边形”的是______.
A.平行四边形 B.菱形 C.矩形 D.正方形
(2)【知识运用】等补四边形
中,若
,则
______
.
(3)【探究发现】如图2,在等补四边形
中,
,连接
,通过观察与测量发现:
平分
,请尝试证明这个发现.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be66a4dad3eda57de0458eec62752245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/e5d740d8-6b7b-407a-89b2-973d21c49056.png?resizew=359)
(1)【概念理解】在以下四种图形中,一定是“等补四边形”的是______.
A.平行四边形 B.菱形 C.矩形 D.正方形
(2)【知识运用】等补四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b5abfd7649b7acee7e1b33be0410e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2a8bf5e05a07c93a7104839fc21849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(3)【探究发现】如图2,在等补四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
,
,点D在线段
上运动(D不与B、C重合)连接
,作
,
交线段
于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/f30648ef-2392-4f71-8c23-0aaffa3cb04d.png?resizew=194)
(1)当
时,求
的度数;
(2)当
等于多少时,
,请说明理由;
(3)在点D的运动过程中,
的形状也在改变,判断当
等于多少度时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3e9ef3e849788645552cfb0735d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.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/3a9608cad892644b4094ed6438b69572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/f30648ef-2392-4f71-8c23-0aaffa3cb04d.png?resizew=194)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f47da34c71f6d794c4f36be456327e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cda279d3cd75eeb603b14a3b94e420.png)
(3)在点D的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b47abcacc10f90489c0d52a9e269ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知:如图,⊙O的直径AB与弦CD相交于E,
,BF⊥AB与弦AD的延长线相交于点F.
![](https://img.xkw.com/dksih/QBM/2012/2/8/1573338137673728/1573338344013824/STEM/2a39f3fdcc744e6e8ee5e1ea2a5f7f64.png?resizew=146)
(1)求证:CD∥BF;
(2)连结BC,若
,
,求⊙O的半径 及弦CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f14d497a05806fff3a63adf83e2d59.png)
![](https://img.xkw.com/dksih/QBM/2012/2/8/1573338137673728/1573338344013824/STEM/2a39f3fdcc744e6e8ee5e1ea2a5f7f64.png?resizew=146)
(1)求证:CD∥BF;
(2)连结BC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8feb9fdc5582ad3e9853890ac2738d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc41bd14d7858dcd942868ed180b782.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】如图,
是
的外接圆,
是
的直径,
,
,
为
的延长线与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/2b63d223-17e2-4c97-8ab6-649d8024fb29.png?resizew=123)
(1)求证:
是
的切线;
(2)若
,
,求
和
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/2b63d223-17e2-4c97-8ab6-649d8024fb29.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcc960364ba71da42fcab71795ab5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图1,
是边长为6cm的等边三角形,边AB在射线OM上,且
cm.点D从O点出发,沿OM方向运动.当点D不与点A重合时,将线段CD绕点C逆时针方向旋转60°得到CE.连接BE,DE.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988617472868352/2991457033994240/STEM/9601879e-337c-46b6-a09e-0c365cab5e6f.png?resizew=560)
(1)如图1,当点D在线段OA上运动时,线段BD、BE、BC之间的数量关系是______,直线AD和直线BE所夹锐角的度数是______;
(2)如图2,当点D运动到线段AB(不与A点重合)上时,(1)中的结论是否仍然成立,若成立,请说明理由;若不成立,请写出正确的结论并说明理由;
(3)如图3,将
改为等腰直角三角形,其中斜边
,其它条件不变,以CD为斜边在其右侧作等腰直角三角形CDE,连接BE,请问BE是否存在最小值,若存在,直接写出答案;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715d148b688cff0fa2554d6434ec08b9.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988617472868352/2991457033994240/STEM/9601879e-337c-46b6-a09e-0c365cab5e6f.png?resizew=560)
(1)如图1,当点D在线段OA上运动时,线段BD、BE、BC之间的数量关系是______,直线AD和直线BE所夹锐角的度数是______;
(2)如图2,当点D运动到线段AB(不与A点重合)上时,(1)中的结论是否仍然成立,若成立,请说明理由;若不成立,请写出正确的结论并说明理由;
(3)如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
您最近一年使用:0次