如图,已知:AB=AC,BD=CD,E为AD上一点.
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918251732254720/3027597091602432/STEM/015d5fd1680a460fb62458720d944b39.png?resizew=179)
(1)求证:△ABD≌△ACD;
(2)若∠BED=50°,求∠CED的度数.
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918251732254720/3027597091602432/STEM/015d5fd1680a460fb62458720d944b39.png?resizew=179)
(1)求证:△ABD≌△ACD;
(2)若∠BED=50°,求∠CED的度数.
21-22八年级上·湖北省直辖县级单位·期末 查看更多[5]
湖北省省直辖县级行政单位仙桃市2021-2022学年八年级上学期期末数学试题(已下线)12.2.1 三角形全等的判定(SSS和SAS)(练习)-2022-2023学年八年级数学上册同步精品课堂(人教版)(已下线)专题4.12 探索三角形全等的条件(SSS和SAS)(巩固篇)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(北师大版)(已下线)专题4.10 探索三角形全等的条件(SSS和SAS)(知识讲解)-2022-2023学年七年级数学下册基础知识专项讲练(北师大版)(已下线)2023年云南省中考数学真题变式题16-20题
更新时间:2022-07-21 22:44:57
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解答题-证明题
|
适中
(0.65)
【推荐1】有一块等腰三角形木板,其中
(如图),王师傅准备把它分成全等的两部分,
小明和小刚分别设计了两种方案:
(1)小明:确定BC的中点D,连结
(如图1).
(2)小刚:作
于D(如图2).
王师傅说两种办法都行,请选择一种说出其中的道理(写出已知、求证、证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
小明和小刚分别设计了两种方案:
(1)小明:确定BC的中点D,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)小刚:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
王师傅说两种办法都行,请选择一种说出其中的道理(写出已知、求证、证明).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/ee9ee535-7b50-44be-9c12-27c50af74d22.png?resizew=229)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】尺规作图,不写作法,保留作图痕迹.
(1)已知
,现将
绕点B逆时针旋转,使点A落在射线
上,可得
,
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/224efc98-8e77-4794-9e1d-7d0833e414fa.png?resizew=142)
作法:
①在射线
上作
;
②以点B为圆心,
长为半径作弧,以点
为圆心,
长为半径作弧,两弧在射线
的右侧交于点
;
③连接
,
.则
即为所求.
经过上述操作可知
与
的关系是______,理由是______.
(2)如图,在直线
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,
的距离相等.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd095ed5f60cf1dcb854568520ce66a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/224efc98-8e77-4794-9e1d-7d0833e414fa.png?resizew=142)
作法:
①在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714dab3c2f68bc7edf6a613faf9f12fd.png)
②以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd095ed5f60cf1dcb854568520ce66a9.png)
经过上述操作可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd095ed5f60cf1dcb854568520ce66a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
(2)如图,在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/827b6649-5473-4625-871e-a8ee10371eff.png?resizew=144)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在等腰
中,
,分别过点A,C作
,
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,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/718c9b48-5681-4d88-be1e-5ac05c636763.png?resizew=159)
(1)求证:
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(2)若
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的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531d6f90f144551a35d494b1fe7d2b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/718c9b48-5681-4d88-be1e-5ac05c636763.png?resizew=159)
(1)求证:
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(2)若
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解答题-证明题
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适中
(0.65)
【推荐2】
是
上的一条不经过圆心的弦,
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/4425a30c-4393-42b6-9be2-df196794d916.jpg?resizew=387)
(1)如图①,
是直径,
交
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(2)如图②,连接
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交
于点D.求证:
;
(3)如图③,连接
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的值是否为定值,若是,请求出这个值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c669fb827b0db3b0d7213af1f980ab.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/4425a30c-4393-42b6-9be2-df196794d916.jpg?resizew=387)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5b907956ebf624d29eb4a2e593efb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ebbfc71152258b7eb3f3c299376f30c.png)
(2)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f4806f3dafdd18185dfb7ac7ac6684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6e3483ecb7a5a8db79b719bf17626c.png)
(3)如图③,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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