摩天轮(如图1)是游乐场中受欢迎的游乐设施之一,它可以看作一个大圆和六个全等的小圆组成(如图2),大圆绕着圆心O匀速旋转,小圆通过顶部挂点(如点P,N)均匀分布在大圆圆周上,由于重力作用,挂点和小圆圆心连线(如
)始终垂直于水平线l.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/52bfccf1-1afe-4f12-b015-d10db9d144dc.jpg?resizew=344)
(1)
_______°;
(2)若
的半径为10,小圆的半径都为1;
①当圆心H到l的距离等于
时,求OH的长;
②求证:在旋转过程中,
的长为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/52bfccf1-1afe-4f12-b015-d10db9d144dc.jpg?resizew=344)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f328b3bb3a14e6c4e5d1a0794ff0a90.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
①当圆心H到l的距离等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②求证:在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
更新时间:2023-05-04 11:16:39
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相似题推荐
解答题-证明题
|
适中
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【推荐1】[结论证明]
(1)证明:在直角三角形中,30°角所对的直角边是斜边的一半.
已知:如图,在Rt
ABC中,∠ACB=90°,∠A=30°.
求证: .
证明:
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893066171039744/2895157572665344/STEM/8d5399e7-7bca-43e8-b2c9-082bded66b02.png?resizew=87)
[知识应用]
如图,平面直角坐标系中,∠BAO=30°,点A的坐标为(4,0),C是AO的中点,D为AB上一动点,连接CD,点A关于直线CD的对称点为
.
(2)当CD⊥AB时,点
的坐标为 ;
(3)当C
⊥AB时,求点
的坐标.
(1)证明:在直角三角形中,30°角所对的直角边是斜边的一半.
已知:如图,在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
求证: .
证明:
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893066171039744/2895157572665344/STEM/8d5399e7-7bca-43e8-b2c9-082bded66b02.png?resizew=87)
[知识应用]
如图,平面直角坐标系中,∠BAO=30°,点A的坐标为(4,0),C是AO的中点,D为AB上一动点,连接CD,点A关于直线CD的对称点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(2)当CD⊥AB时,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(3)当C
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893066171039744/2895157572665344/STEM/2a20f5bf-9ccf-4798-a4da-1a2055ed4da3.png?resizew=397)
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解答题-作图题
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适中
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【推荐2】如图,在
中,
,将
绕点A逆时针旋转得到
,使点
落在
边上.
(1)过点
作
的垂线,并在垂线上截取
,连接
.(尺规作图,不写作法,保留作图痕迹);
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc611174bf65d85b1cf632cff6a8ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2065fe85fc583dd9b587a0933f003d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/3854d4ed-f4da-4e26-a460-bbe9fdf2fcaf.png?resizew=135)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f9c3439fa8f2e2f2bdba63e3df98d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473587f1d184e051ae5b51f45d506247.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
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解答题-问答题
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【推荐1】在
中,
,
,点P是线段CB上的一个动点(不与点B,C重合),过点P作直线
交AB于点Q.给出如下定义:若在AC边上存在一点M,使得点M关于直线l的对称点N恰好在 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
的边上 ,则称点M是
的关于直线l的“反称点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/22/ab69dc5b-89f5-4e38-8d46-629783acd18c.png?resizew=434)
例如,图1中的点M是
的关于直线l的“反称点”.
(1)如图2,若
,点
,
,
,
在AC边上且
,
,
,
.在点
,
,
,
中,是
的关于直线l的“反称点”为______;
(2)若点M是
的关于直线l的“反称点”,恰好使得
是等腰三角形,求AM的长;
(3)存在直线l及点M,使得点M是
的关于直线l的“反称点”,直接写出线段CP的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36d87153e50e195347e7b7ef685a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67430da2246941b2966ba8c1ebd5d120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397dfc3db79d0fdbbd7a98ae0a0c963d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/22/ab69dc5b-89f5-4e38-8d46-629783acd18c.png?resizew=434)
例如,图1中的点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
(1)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ae300e4ff3e89d0e1e5671eacd9585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fa71450b470cb7d6464339873d74b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278b64b858c9fbed2d298a89a3512c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc47be32362ded5f2711629c518772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d85e4398dbd3449ca35f7e312906554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd50929761628a4af26e7288119f019f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fa71450b470cb7d6464339873d74b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
(2)若点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db609c0ddcb9af21ddbf443d3e527cfa.png)
(3)存在直线l及点M,使得点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
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名校
【推荐2】如图,在菱形ABCD中,对角线AC,BD交于点O,
交CB延长线于E,
交AD延长线于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938999115726848/2942406290898944/STEM/1261cb0a-e727-4a19-bcc1-693ae13689c4.png?resizew=197)
(1)求证:四边形AECF是矩形;
(2)若
,
,求OB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883200c4d4e82a5411064a644aabfe33.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938999115726848/2942406290898944/STEM/1261cb0a-e727-4a19-bcc1-693ae13689c4.png?resizew=197)
(1)求证:四边形AECF是矩形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
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【推荐1】如图,在▱ABCD中,对角线AC,BD相交于点O,且OA=OB.
(1)求证:四边形ABCD是矩形;
(2)若AD=4,∠AOD=60°,求AB的长.
(1)求证:四边形ABCD是矩形;
(2)若AD=4,∠AOD=60°,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/504448eb-52d7-412a-8d29-35ff1193be86.png?resizew=193)
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解答题-证明题
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【推荐2】如图,已知正方形
.
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629076520312832/2635148148678656/STEM/83e5b3e0bf12450fb1da2dda3c4086dd.png?resizew=576)
(1)如图1,
是
上一点,过
上一点
作
的垂线交
于点
,交
于点
,求证:
.
(2)如图2,过正方形
内任意一点作两条互相垂直的直线,分别交
,
于点
,
,交
,
于点
,
,
与
相等吗?请写出你的结论.
(3)当点
在正方形
的边上或外部时,过点
作两条互相垂直的直线,被正方形相对的两边(或它们的延长线)截得的两条线段还相等吗?其中一种情形如图3所示,过正方形
外一点
作互相垂直的两条直线
,
,
与
,
的延长线分别交于点
,
,
与
,
的延长线分别交于点
,
,试就该图形对你的结论加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2629076520312832/2635148148678656/STEM/83e5b3e0bf12450fb1da2dda3c4086dd.png?resizew=576)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5010595a0792e88fcc416e9eeaebec80.png)
(2)如图2,过正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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解答题-作图题
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适中
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【推荐1】如图所示,△ABC与点O在10×10的网格中的位置如图所示
(1)画出△ABC绕点O逆时针旋转90°后的图形;
(2)画出△ABC绕点O逆时针旋转180°后的图形;
(3)若⊙M能盖住△ABC,则⊙M的半径最小值为 .
(1)画出△ABC绕点O逆时针旋转90°后的图形;
(2)画出△ABC绕点O逆时针旋转180°后的图形;
(3)若⊙M能盖住△ABC,则⊙M的半径最小值为 .
![](https://img.xkw.com/dksih/QBM/2020/3/24/2426279194042368/2429436730867712/STEM/1b02b9a00d9f4c5f85b5e112851cbe62.png?resizew=209)
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解答题-作图题
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适中
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名校
【推荐2】图①、图②、图③均是
的正方形网格,每个小正方形的边长均为1,每个小正方形的顶点称为格点.点A、B、M、N均在格点上,只用无刻度的直尺,分别在给定的网格中按要求作图.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/532598b7-d772-4739-aa71-4f821b451c82.png?resizew=380)
(1)在图①中,找一格点C,连接
,使
;
(2)在图②中,在线段
上找一点C,连接
,使
;
(3)在图③中,经过点A、B、M作圆,在优弧
上找一点C,连接
,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd12b1e161e68c936f57aea483e20d5c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/532598b7-d772-4739-aa71-4f821b451c82.png?resizew=380)
(1)在图①中,找一格点C,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
(2)在图②中,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
(3)在图③中,经过点A、B、M作圆,在优弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
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