如图,在四边形
中,
为
的中点,连接
,延长
交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/6850ce95-8924-4878-a6c3-2c67c81cf915.png?resizew=154)
(1)
和
全等吗?说明理由;
(2)若
,说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05e84c118ff3633ea0eb59f44fe9364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c8ba4da3a6b049f010c91ccb4f328ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/6850ce95-8924-4878-a6c3-2c67c81cf915.png?resizew=154)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c333f2e1769473c6ada9790f841572.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7660397da21f66377e239a57e26d1c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d498c5bd6f0bc27ab2ebd2c003c666.png)
更新时间:2024-01-25 14:20:38
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相似题推荐
解答题-问答题
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【推荐1】如图,AB
CD,∠1=∠A.
(1)试说明:AC
ED;
(2)若∠2=∠3,FC与BD的位置关系如何?为什么?
请在下面的解答过程的空格内填写理由或数学式.
解:(1)∵AB
CD,(已知)
∴∠1=∠BED,( )
又∵∠1=∠A,(已知)
∴∠BED=∠ ,(等量代换)
∴
.( )
(2)FC与BD的位置关系是: .理由如下:
∵AC
ED,(已知)
∴∠2=∠ .( )
又∵∠2=∠3,(已知)
∴∠ =∠ .(等量代换)
∴
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(1)试说明:AC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)若∠2=∠3,FC与BD的位置关系如何?为什么?
请在下面的解答过程的空格内填写理由或数学式.
解:(1)∵AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠1=∠BED,( )
又∵∠1=∠A,(已知)
∴∠BED=∠ ,(等量代换)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)FC与BD的位置关系是: .理由如下:
∵AC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴∠2=∠ .( )
又∵∠2=∠3,(已知)
∴∠ =∠ .(等量代换)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/2/22/2921850364657664/2937357537796096/STEM/b6513c44-13d9-4800-a7f9-547f5cad0988.png?resizew=199)
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【推荐2】已知,在△ABC中,BD平分∠ABC,CD平分∠ACB,BD,CD交于点D,EF过点D交AB于点E,交AC于点F.
(1)如图1,若EF∥BC,则∠BDE+∠CDF的度数为 (用含有∠A的代数式表示);
(2)当直线EF绕点D旋转到如图2所示的位置时,(1)中的结论是否成立?请说明理由;
(3)当直线EF绕点D旋转到如图3所示的位置时,(1)中的结论是否成立?若成立,请说明理由;若不成立,请求出∠BDE,∠CDF与∠A之间的关系.
(1)如图1,若EF∥BC,则∠BDE+∠CDF的度数为 (用含有∠A的代数式表示);
(2)当直线EF绕点D旋转到如图2所示的位置时,(1)中的结论是否成立?请说明理由;
(3)当直线EF绕点D旋转到如图3所示的位置时,(1)中的结论是否成立?若成立,请说明理由;若不成立,请求出∠BDE,∠CDF与∠A之间的关系.
![](https://img.xkw.com/dksih/QBM/2020/3/20/2423438163075072/2423821970481152/STEM/509fed559f0c431aa623ccb3b605cd01.png?resizew=554)
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解答题-证明题
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【推荐1】在
中,
,
分别平分
、
,交
于点D、E;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/6bc954a5-ab5d-4412-8eaa-c17039ce0327.png?resizew=229)
(1)如图1,求证:
;
(2)如图2,若
,请直接写出图中等于
的角(
除外).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee06d1b67343eac57e4bc24580799c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f279d402050043751e941f3bd7aaf7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/6bc954a5-ab5d-4412-8eaa-c17039ce0327.png?resizew=229)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c72942e305dfdede4b4f44c650e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b398c95494eddc79939f16e66cf4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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名校
【推荐2】如图,点E、F分别在平行四边形
的边
、
上,若
平分
,
平分
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/f9f8c6a1-54d4-45ae-bc58-27162bdf221e.png?resizew=178)
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解答题-作图题
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【推荐1】如图,
是等腰直角三角形,
,
为
延长线上一点,连接
,将线段
绕点
逆时针旋转
得到线段
,过点
作
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/bb5e62fb-a112-46e5-819d-bf51a464370d.png?resizew=106)
(1)依题意补全图形;
(2)比较
与
的大小,并证明;
(3)连接
,
为
的中点,连接
,用等式表示线段
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a57b5c43bb7798446f173dbb07191ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/bb5e62fb-a112-46e5-819d-bf51a464370d.png?resizew=106)
(1)依题意补全图形;
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f0fca7b7c720ec099f77378e9126b96.png)
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