如图,点B、E、C、F在一条直线上,∠B=∠DEF,AB=DE,BE=CF,∠F=70°,求∠ACB的度数.
![](https://img.xkw.com/dksih/QBM/2016/3/18/1574184346042368/1574184352317440/STEM/03e11623b4914fb8977065ae7dbe5870.png?resizew=179)
更新时间:2016-12-06 11:49:10
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解答题-证明题
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适中
(0.65)
【推荐1】【理解概念】
一组邻边相等,且这组邻边所夹内角的对角被对角线平分的四边形叫做等平四边形,这条对角线叫做等平对角线.
(1)下列四边形是等平四边形的是 .(填序号)
①平行四边形;②菱形;③矩形;④正方形.
【探索性质】
(2)如图①,在等平四边形
中,
,
平分
.若
,则
与
有怎样的数量关系?说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/eac33307-2052-48b3-9063-6a195e112b25.png?resizew=565)
【解决问题】
(3)如图②,四边形
中,
,
.求证:四边形
是等平四边形.
一组邻边相等,且这组邻边所夹内角的对角被对角线平分的四边形叫做等平四边形,这条对角线叫做等平对角线.
(1)下列四边形是等平四边形的是 .(填序号)
①平行四边形;②菱形;③矩形;④正方形.
【探索性质】
(2)如图①,在等平四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9199a3de404cb13ae7710f73db5c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/eac33307-2052-48b3-9063-6a195e112b25.png?resizew=565)
【解决问题】
(3)如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,点
是
中点,点
是射线
上的一点.连接
并延长交
于点
.
(1)若
,则
_________;
(2)求证:
.
![](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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/e8e1ba62-3f59-40de-9c39-4476df91bee2.png?resizew=172)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78321cc8025d01deeab298cc92b9f8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439d51906c864db626168a3274370a7f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c10c3c87a58c64b705c2f347e3987b.png)
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