(1)在平面直角坐标系中A(5,0),B为y轴上任意一点,以点B为直角顶点作等腰Rt△ABC(点A、B、C按顺时针方向排列),请探究点C是否在一确定的直线上;
(2)在平面直角坐标系中,A(﹣1,0),B(4,2m),连接AB,将AB绕点B逆时针旋转90°到CB,请探究点C是否在一确定的直线上.
(2)在平面直角坐标系中,A(﹣1,0),B(4,2m),连接AB,将AB绕点B逆时针旋转90°到CB,请探究点C是否在一确定的直线上.
2020·天津红桥·三模 查看更多[1]
(已下线)2020年天津市红桥区中考数学三模试题
更新时间:2020-05-04 19:51:28
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相似题推荐
解答题-证明题
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【推荐1】综合与实践:
问题情境:在一次综合实践活动课上,同学们以菱形为对象,研究菱形旋转中的问题:
已知,在菱形ABCD中,BD为对角线,
,AB=4,将菱形ABCD绕顶点A顺时针旋转,旋转角为
(单位°).旋转后的菱形为
.在旋转探究活动中提出下列问题,请你帮他们解决.
观察证明:
(1)如图1,若旋转角
,
与BD相交于点M,AB与
相交于点N.请说明线段DM与
的数量关系;
操作计算:
(2)如图2,连接
,菱形ABCD旋转的过程中,当
与AB互相垂直时,
的长为 ;
(3)如图3,若旋转角
,分别连接
,
,过点A分别作
,
,连接EF,菱形ABCD旋转的过程中,发现在
中存在长度不变的线段EF,请求出EF长度;
操作探究:
(4)如图4,在(3)的条件下,请判断以
,
,
三条线段长度为边的三角形是什么特殊三角形,并说明理由.
问题情境:在一次综合实践活动课上,同学们以菱形为对象,研究菱形旋转中的问题:
已知,在菱形ABCD中,BD为对角线,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdd511e3eb724a9add64021b9b6f8c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/eefcab7f-64b3-4c70-bff8-278ab9ef1cbc.png?resizew=570)
观察证明:
(1)如图1,若旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5dbe9c38a6d4f8be035861eae0b0048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46c836f4108d26b7ac0b45cc872816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba25c398b41939559a52518e8b251af6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/43a3409c-7e78-4664-8fd8-92a7455d50c4.png?resizew=586)
操作计算:
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46c836f4108d26b7ac0b45cc872816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
(3)如图3,若旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5dbe9c38a6d4f8be035861eae0b0048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac6fe73f89c450bee8083c014f34e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95087161482cf6fc8b7ad244be5fe9b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63df0f5cad1a1d8c5e6ae5f3bc8f837b.png)
操作探究:
(4)如图4,在(3)的条件下,请判断以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
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解答题-问答题
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【推荐2】(1)问题发现
如图1,在
中,
,点
为
的中点,以
为一边作正方形
,点
恰好与点
重合,则线段
与
的数量关系为______________;
(2)拓展探究
在(1)的条件下,如果正方形
绕点
旋转,连接
,线段
与
的数量关系有无变化?请仅就图2的情形进行说明;
(3)问题解决.
当正方形
旋转到
三点共线时,直接写出线段
的长.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b5109a440ec02546627e6e388c71b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)拓展探究
在(1)的条件下,如果正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef19532b6e95cb08d89a4da10122bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(3)问题解决.
当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf877a70d062eb325f9ba27108e8631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2020/2/23/2405370260168704/2406179682369536/STEM/6a761441-8e9e-4d70-9747-9071bc44c004.png)
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【推荐1】如图,已知A、B、C三点在同一条直线上,△ABD与△BCE都是等边三角形.其中线段AE交DB于点F,线段CD交BE于点G.
求证:
.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2704ac0eaa464dcf892a7527f3a5ab.png)
![](https://img.xkw.com/dksih/QBM/2018/6/14/1967042171658240/1971844152860672/STEM/6941ba09c2e9417cb3d21b1b9efcab4a.png?resizew=118)
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【推荐2】已知:如图,
是
的直径,C是
上一点,
于点D,过点C作
的切线,交
的延长线于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/01cc9384-92e3-4f0a-93e4-59d5fb80334f.png?resizew=120)
(1)求证:
与
相切;
(2)连接
,若
,
,求
的长;
(3)若
,
,点F是
任意一点,点M是弦
的中点,当点F在
上运动一周,则点M运动的路径长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11c1db76cc7e1894f74a50d71736455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/01cc9384-92e3-4f0a-93e4-59d5fb80334f.png?resizew=120)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1ff9507413b21d0434dd6e208e19df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715d148b688cff0fa2554d6434ec08b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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