如图(1)所示,已知在
中,
,
在边
上,点
为边
中点,为以
为圆心,
为半径的圆分别交
,
于点
,
,联结
交
于点
.
,求证:四边形
为平行四边形;
(2)如图(2)所示,联结
,如果
,求边
的长;
(3)联结
,如果
是以
为腰的等腰三角形,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aef30e0197389432d370a15f31ed6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f2ab2ed9378fa2c1a24ab16a97be1e.png)
(2)如图(2)所示,联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/797ee0d1476db4fcfd287ebf51b0b79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
(3)联结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2acc92168e9c5783240ade1160a8997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eab2c3682886b813bb39e3b7d517a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b8d944622210c6d755690da957007e.png)
2023·上海·中考真题 查看更多[7]
(已下线)2023年上海市中考数学真题(已下线)专题14 几何综合题(37题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)专题17 几何压轴题-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)(已下线)2023年上海市中考数学真题变式题20-25题江苏省泰州市靖江市靖城中学2023-2024学年九年级上学期12月月考数学试题27.2.2相似三角形的性质(已下线)重难点03 圆中的有关证明与计算(9大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(上海专用)
更新时间:2023-06-19 17:18:42
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相似题推荐
解答题-证明题
|
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名校
【推荐1】如图①,在
中,
,
是
外接圆
上一点,连接
,过点
作
,交
的延长线于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/4/27/2974284817227776/2979799907483648/STEM/24c40b25-8412-42cf-b43d-240f932ab76a.png?resizew=484)
(1)求证:四边形
是平行四边形;
(2)如图②,若
为
直径,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41f2f95d643629321deb6e905c4f1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/4/27/2974284817227776/2979799907483648/STEM/24c40b25-8412-42cf-b43d-240f932ab76a.png?resizew=484)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec07464a1b5bc7a2cc338b1a13e0f4a6.png)
(2)如图②,若
![](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/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】如图,在四边形
中,对角线
与
相交于点
且
,
,过点
作
交
于点
.
(1)求证:四边形
为菱形;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a23f35ebcd9799d82c1e41c09781a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde905ad69312d51289cb316395e7995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f9cb93947d668d2e054348103f8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/9/1c90a46b-2b93-4117-a02e-a705b921238b.png?resizew=160)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452c86b1d5e29aadad048d90fd024990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb9661378548fb3c4f1e81a44de6214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-作图题
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【推荐1】如图,在
中,
,点D为平面上一点,连接
,将
绕着点A逆时针旋转
得到线段
,连接
,取
的中点F,取
的中点G,连接
,取
的中点M,连接
.
(2)猜想
的度数(用含α的式子表示),并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21958ecce9a9fcccc2998d2ba7990c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efc7b22d85ff04a0ac89743f0bea1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea869b465b92ca404a71fe84467cd35.png)
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【推荐2】实践与探究:
操作一:已知边长为8正方形纸片ABCD,将正方形纸片ABCD对折,使得点A和点D重合,点B和点C重合,折痕为EF.
操作二:如图①,将正方形纸片ABCD沿过点B的直线翻折,点A的对应点为点N,折痕为BM.当N落在EF上时,BF和BN的数量关系是______;
的大小为______.
操作三:如图②,再将纸片沿直线BN翻折,点M的对应点为点
.当点
在CD上时,求
的度数.
操作四:如图③,当点M沿
运动时,EN中点为K,连接DK,DK的最小值为______.
操作一:已知边长为8正方形纸片ABCD,将正方形纸片ABCD对折,使得点A和点D重合,点B和点C重合,折痕为EF.
操作二:如图①,将正方形纸片ABCD沿过点B的直线翻折,点A的对应点为点N,折痕为BM.当N落在EF上时,BF和BN的数量关系是______;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6e63383249964f25eef817d1cfb58e.png)
操作三:如图②,再将纸片沿直线BN翻折,点M的对应点为点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76e136e7df3692ae6536fc70b6961a9.png)
操作四:如图③,当点M沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fcc497b16c43b39596b64d77c969771.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/c3ee33b9-3007-4141-8e7a-67d7c2e75a7a.png?resizew=480)
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【推荐3】如图1,已知△ABC为等边三角形,点D,E分别在边AB、AC上, AD=AE ,连接DC,点M,P,N分别为DE,DC,BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8b790c10-3fe3-445f-9c22-811857e7347d.png?resizew=355)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/68836ba6-441e-46e5-a90e-3ddcc1f41d01.png?resizew=259)
(1)观察猜想
在图1中,线段PM与PN的数量关系是______,∠MPN的度数是______;
(2)探究证明
若△ABC为直角三角形, ∠BAC=90° , AB=AC ,点DE分别在边AB,AC上, AD=AE,把△ADE绕点A在平面内自由旋转,如图2.连接DC,点M,P,N分别为DE,DC,BC的中点.判断△PMN的形状,并说明理由;
(3)拓展延伸
若△ABC中∠BAC=120°, AB=AC=13,点D,E分别在边AB,AC上, AD=AE=5 ,连接DC,点M,P,N分别为DE,DC,BC的中点.把△ADE绕点A在平面内自由旋转,如图3.
①△PMN的是______三角形.
②若△PMN面积为S,直接利用①中的结论,求S的取值取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8b790c10-3fe3-445f-9c22-811857e7347d.png?resizew=355)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/68836ba6-441e-46e5-a90e-3ddcc1f41d01.png?resizew=259)
(1)观察猜想
在图1中,线段PM与PN的数量关系是______,∠MPN的度数是______;
(2)探究证明
若△ABC为直角三角形, ∠BAC=90° , AB=AC ,点DE分别在边AB,AC上, AD=AE,把△ADE绕点A在平面内自由旋转,如图2.连接DC,点M,P,N分别为DE,DC,BC的中点.判断△PMN的形状,并说明理由;
(3)拓展延伸
若△ABC中∠BAC=120°, AB=AC=13,点D,E分别在边AB,AC上, AD=AE=5 ,连接DC,点M,P,N分别为DE,DC,BC的中点.把△ADE绕点A在平面内自由旋转,如图3.
①△PMN的是______三角形.
②若△PMN面积为S,直接利用①中的结论,求S的取值取值范围.
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【推荐1】综合与探究
如图,在平面直角坐标系中,直线
与x轴交于点A,与y轴交于点B,抛物线
经过A,B两点,且与x轴的负半轴交于点C.
(1)求该抛物线的解析式;
(2)若点
在抛物线上,且
,则n的取值范围是__________;
(3)P为直线
上方抛物线上的一点,过点P作
于点Q,求
的最大值;
(4)若点D在直线
上方的抛物线上,且
,直接写出点D的坐标.
如图,在平面直角坐标系中,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9118cc77fc0a045337745890e50cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/5fb3b721-0d7a-4dda-846a-764b186b1a34.png?resizew=153)
(1)求该抛物线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaaa54424e1a3c30d1bedb48f3285d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bad97b34b0879b8c3714f905c4a8193.png)
(3)P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(4)若点D在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ea6d0ce9e95418b128fc1158e46784.png)
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【推荐2】 如图,正方形ABCD的对角线AC、BD交于点O,∠ABD的平分线BE交AC于G,交AD于F,且DE⊥BE.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2424937137995776/2435571791527936/STEM/365c1855895a43fbb9579cdc9e97bf32.png?resizew=137)
(1)求证:DE=
BF;
(2)若BG=
,求BF的长.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2424937137995776/2435571791527936/STEM/365c1855895a43fbb9579cdc9e97bf32.png?resizew=137)
(1)求证:DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
(2)若BG=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
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解题方法
【推荐1】如图,
是四边形
的外接圆,连接
,且
.
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724214081069056/2730237222682624/STEM/eeda86c29f9b4552b85b68eaaa125e5b.png?resizew=468)
(1)如图1,求证:
;
(2)如图2,连接
,求证:
;
(3)如图3,当
为直径时,过点
作
的垂线,垂足为
,以
为轴翻折
,点
的对应点为
,点
在
上,连接
,并延长
交
于
,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6ac26ed054c9d649056d1bbf012359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d92aec35524c5cbc6097642938b3ca2.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724214081069056/2730237222682624/STEM/eeda86c29f9b4552b85b68eaaa125e5b.png?resizew=468)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30dae4aab0135cc0179fe15ef02220cc.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdda64e2dd89a47e4f4e137c229607c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a13440086eccb01c6c0cb012da11cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2023e93e3d79b1babd0a2e796cf2585d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】对于平面直角坐标系
中的图形
和图形
,给出如下定义:在图形
上存在两点A,B(点A,B可以重合),在图形
上存在两点M,N(点M,N可以重合)使得
,则称图形
和图形
满足限距关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/0145d9cc-1421-4c3c-bb89-d6f2f279850a.png?resizew=335)
(1)如图1,点
,点P在线段
上运动(点P可以与点C,E重合),连接
.
①线段
的最小值为_____________,最大值为_____________;线段
的取值范围是______________;
②点O与线段
______________(填“是”或“否”)满足限距关系;
(2)在(1)的条件下,如图2,
的半径为1,线段
与x轴、y轴正半轴分别交于点F,G,且
,若线段
与
满足限距关系,求点G纵坐标的取值范围;
(3)
的半径为
,点H,K是
上的两个点,分别以H,K为圆心,3为半径作圆得到
和
,若对于任意点H,K,
和
都满足限距关系,直接写出r的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8021150f6a208a316d31cb8313e42b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/0145d9cc-1421-4c3c-bb89-d6f2f279850a.png?resizew=335)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8040fbbe3092651b5333f07cd7b8753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf102743864ca9de02284defb7cc8fb.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
②点O与线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)在(1)的条件下,如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12850119b4a552fd2f31178210ba7f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e1b2d25e575038885c5eddf1ddb229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f3be3806ce3b7b636535b64c8db3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9110c10c6b6abeb9021f59dd7852125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f3be3806ce3b7b636535b64c8db3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9110c10c6b6abeb9021f59dd7852125.png)
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