在综合实践课上,老师组织同学以“图形的旋转”为主题开展数学活动,下面是同学们进行相关问题的研究.
【观察猜想】如图①,
和
均为等边三角形,当点E、D分别在
边上,易证:
,
.
【实践发现】如图②,将图①中的
绕着点B逆时针旋转,连接
、
,线段
与线段
的数量关系为 ,直线
与直线
相交,所夹锐角为 °;
【类比探究】
和
均为直角三角形,
.
(1)观察感知:如图③,当
且点E、D分别在
边上,易证:
;
(2)问题呈现:如图④,将图③中的
绕着点B逆时针旋转,连接
、
.直线
与直线
交于点M.线段
与线段
的数量关系为 ,
°;
(3)探究证明:如图⑤,当
时,线段
与线段
的数量关系是什么?请说明理由,此时,
°;
(4)拓展应用:在(3)的条件下,若
,
,将
绕点B逆时针旋转一周,在整个旋转过程中,当点A、E、D三点共线时,请直接写出点C到直线
的距离.
【观察猜想】如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167244299094a808062fbed22e86c85d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/4b099878-cd00-4749-a44b-f4ed508b5b0f.png?resizew=481)
【实践发现】如图②,将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【类比探究】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0dd821851a38e5cbe13f63bee31fb4.png)
(1)观察感知:如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167244299094a808062fbed22e86c85d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df328e9c83adf972fefc96473cd30ce.png)
(2)问题呈现:如图④,将图③中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb985ac5d93b85b6299834627aa95ab7.png)
(3)探究证明:如图⑤,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad0ceba52cde72e3621e6d50e477215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb985ac5d93b85b6299834627aa95ab7.png)
(4)拓展应用:在(3)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d032bd2ccb64e1b027dc06c42119a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18444ec3e5e3b8a0cf488732c34866d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2023-06-13 15:15:02
|
相似题推荐
解答题-证明题
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【推荐1】如图,已知
三个内角的平分线文于点
,点
在
的延长线上,且
,
.
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f213621229843639780aae87fa29584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5963ad524682b8c3d6737b7e8bf4602.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/dd6db6d4-e7db-4b0c-afd4-5d35ec1fa8a4.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5fd16e45713dd03b35ecc348c7751a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b3ccbed8aa44da96fbf16bb9978b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
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【推荐2】如图,在
中,点A,B,C,D为圆周的四等分点,
为切线,连接
.并延长交
于点F,连接
交
于点G.
平分
;
(2)求证:
;
(3)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6734ae411cc7bf2d9c247d16a5aaefbe.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35093548e569a89e6486a35c4fe5d00a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082ff5f5f3ef438de9d2b8257b3bd261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d166048938647f6547db933ff904c9b.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】在平面直角坐标系
中(如图),已知抛物线
(
)与x轴交于点
和
,与y轴交于点
.抛物线的顶点为点
.
的坐标;
(2)将直线
绕点
顺时针旋转,交
轴于点
.此时旋转角
等于
.
①求点
的坐标;
②二次函数
的图象始终有一部分落在
的内部,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc229acc8bf1a2047394bda863b1ea71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f169a354d2612e7a9ea0297ab697727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c941cb13f64020851fd09e0514f2502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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名校
【推荐2】阅读下面材料:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/9fe8f713-dd25-4a54-85b5-e8278bbcdfe4.png?resizew=481)
小岩遇到这样一个问题:如图1,在正三角形ABC内有一点P,且PA=1,
,PC=2,求∠APB的度数;
小岩是这样思考的:如图2,利用旋转和全等的知识构造
,连接
,得到两个特殊的三角形,从而将问题解决.
(1)请你回答:图1中∠APB的度数等于____;(直接写答案)
参考小岩同学思考问题的方法,解决下列问题:
(2)如图3,在正方形ABCD内有一点P,且
,
,
.求∠APB的度数;
(3)如图4,在正六边形ABCDEF内有一点P,若∠APB=
,直接写出PA,PB和PF的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/9fe8f713-dd25-4a54-85b5-e8278bbcdfe4.png?resizew=481)
小岩遇到这样一个问题:如图1,在正三角形ABC内有一点P,且PA=1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
小岩是这样思考的:如图2,利用旋转和全等的知识构造
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d0f53af0839b0f803e470f0cf42c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
(1)请你回答:图1中∠APB的度数等于____;(直接写答案)
参考小岩同学思考问题的方法,解决下列问题:
(2)如图3,在正方形ABCD内有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f29c3e772e56008790298824122792.png)
(3)如图4,在正六边形ABCDEF内有一点P,若∠APB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
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解题方法
【推荐3】已知:边长为4的正方形ABCD,∠EAF的两边分别与射线CB、DC相交于点E、F,且∠EAF=45°,连接EF.求证:EF=BE+DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/aca41055-d2b7-4541-ad9c-f10026b3fcee.png?resizew=511)
思路分析:
(1)如图1,∵正方形ABCD中,AB=AD,∠BAD=∠B=∠ADC=90°,
∴把△ABE绕点A逆时针旋转90°至△ADE',则F、D、E'在一条直线上,
∠E'AF= 度,……
根据定理,可证:△AEF≌△AE'F.
∴EF=BE+DF.
类比探究:
(2)如图2,当点E在线段CB的延长线上,探究EF、BE、DF之间存在的数量关系,并写出证明过程;
拓展应用:
(3)如图3,在△ABC中,AB=AC,D、E在BC上,∠BAC=2∠DAE.若S△ABC=14,S△ADE=6,求线段BD、DE、EC围成的三角形的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/aca41055-d2b7-4541-ad9c-f10026b3fcee.png?resizew=511)
思路分析:
(1)如图1,∵正方形ABCD中,AB=AD,∠BAD=∠B=∠ADC=90°,
∴把△ABE绕点A逆时针旋转90°至△ADE',则F、D、E'在一条直线上,
∠E'AF= 度,……
根据定理,可证:△AEF≌△AE'F.
∴EF=BE+DF.
类比探究:
(2)如图2,当点E在线段CB的延长线上,探究EF、BE、DF之间存在的数量关系,并写出证明过程;
拓展应用:
(3)如图3,在△ABC中,AB=AC,D、E在BC上,∠BAC=2∠DAE.若S△ABC=14,S△ADE=6,求线段BD、DE、EC围成的三角形的面积.
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真题
【推荐1】如图,
是⊙O的弦,半径
,垂足为D,弦
与
交于点F,连接
,
,
.
;
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771b610e4ddefa739a985d1e5462ce5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f63e3d15c7aac73ccfeca5b61b95888.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e962f2eb895839b30c5651ccd4ec5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】如图,小明在测量旗杆高度的实践活动中,发现地面上有一摊积水,他刚好能从积水中看到旗杆的顶端,测得积水与旗杆底部的距离
米,他与积水的距离
米,他的眼睛与地面的距离
米,则旗杆的高度
是多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9f245074b6850c0d6ec9d07e9b8950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/e9ace87f-5381-4e7e-a533-34ce3802e275.png?resizew=131)
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【推荐1】如图,在平面直角坐标系中,点A的坐标为(12,−8),点B、C在x轴上,tan∠ABC=
,AB=AC,AH⊥BC于H,D为AC的中点,BD交AH于点M.
![](https://img.xkw.com/dksih/QBM/2015/5/14/1573839261073408/1573839267495936/STEM/525066dd0e83483aafdf846af757cf72.png)
(1)求过B、C、D三点的抛物线的解析式,并求出抛物线顶点E的坐标;
(2)过点E且平行于AB的直线l交y轴于点G,若将(2)中的抛物线沿直线l平移,平移后的抛物线交y轴于点F,顶点为E′(点E′在y轴右侧).是否存在这样的抛物线,使△E′FG为等腰三角形?若存在,请求出此时顶点E’的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2015/5/14/1573839261073408/1573839267495936/STEM/adc25c93a74e43ad9f2996c69ac9d337.png)
![](https://img.xkw.com/dksih/QBM/2015/5/14/1573839261073408/1573839267495936/STEM/525066dd0e83483aafdf846af757cf72.png)
(1)求过B、C、D三点的抛物线的解析式,并求出抛物线顶点E的坐标;
(2)过点E且平行于AB的直线l交y轴于点G,若将(2)中的抛物线沿直线l平移,平移后的抛物线交y轴于点F,顶点为E′(点E′在y轴右侧).是否存在这样的抛物线,使△E′FG为等腰三角形?若存在,请求出此时顶点E’的坐标;若不存在,请说明理由.
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【推荐2】如图,在△ABC中,O为AC上的一点,以点O为圆心OC为半径的⊙O,与BC相切于点C,过点A作AD⊥BO交BO的延长线于点D,且∠AOD=∠BAD.
(1)求证:AB为⊙O的切线;
(2)若∠BAD=60°,⊙O的半径为3,则AD= .点D与⊙O的位置关系为 .
(1)求证:AB为⊙O的切线;
(2)若∠BAD=60°,⊙O的半径为3,则AD= .点D与⊙O的位置关系为 .
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849448818663424/2853442002141184/STEM/cc6526a3-e1b7-47f2-a611-37ec54571a9c.png)
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