1 . 如图,在△ABC中BC<AC,∠A+∠C=60°,点D在BC上,点E在AC上,连接DE,∠ABC=∠DEC,过点B作BF⊥AC于点F.若DB=AB,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae9da6f83c6fd6b062893b2a86755aa.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
A.1 | B.2 | C.![]() | D.![]() |
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2 . 如图,在Rt△ABC中,∠ABC=90°,以BC边的中点O为圆心,
BC为半径作圆,点D是⊙O上一动点,点E是弦CD的中点,连接AE,若BC=4,AB=3,则AE+
BE的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985697865170944/2991237720801280/STEM/de15e49b-861b-48a2-8f58-273517f19eba.png?resizew=242)
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3 . 如图,已知二次函数
的图象经过点
且与x轴交于原点及点
,顶点为A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/e79b0960-d952-4ccc-8208-196777cdd8f1.png?resizew=166)
(1)求二次函数的表达式;
(2)判断
的形状,试说明理由;
(3)若点P为
上的动点,且
的半径为
,一动点E从点A出发,以每秒2个单位长度的速度沿线段
匀速运动到点P,再以每秒1个单位长度的速度沿线段
匀速运动到点B后停止运动,求点E的运动时间t的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ae77c8c436232bb6f0ddd2b95d968c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c95911ef9acebacd76928e930bf37d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd58ef950ddec3eb3ebf8e64f6228ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/e79b0960-d952-4ccc-8208-196777cdd8f1.png?resizew=166)
(1)求二次函数的表达式;
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
(3)若点P为
![](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/f4fdb5584c8adfe3e2ce8670753c3846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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4 . 某校数学兴趣学习小组在一次活动中,对一些特殊几何图形具有的性质进行了如下探究:
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
中,
,点
是边
上任意一点,连接
,以
为腰作等腰
,使
,∠MAN=∠BAC,连接
.求证:
.
(2)类比探究:如图2,在等腰
中,
,
,
,点
是边
上任意一点,以
为腰作等腰
,使
,
.在点
运动过程中,
是否存在最小值?若存在,求出最小值,若不存在,请说明理由.
(3)拓展应用:如图3,在正方形
中,点
是边
上一点,以
为边作正方形
,
是正方形
的中心,连接
.若正方形
的边长为6,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0eef65b7d4459a21b2e8a04b26f58e6.png)
(2)类比探究:如图2,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3120ed27a38e603da96b23aab70dfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)拓展应用:如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5693553cd6992eda2b827fd73fb73766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
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2022-05-29更新
|
284次组卷
|
2卷引用:2022年贵州省遵义市新蒲新区初中生毕业认定测试(三模)数学试卷
5 . 小杰同学在中考总复习时,遇到一个课本上的问题,温故知识后进行了操作推理与拓展应用.
(1)温故知识:如图①,在
中,一个正方形
的边
在
上,顶点P,N分别在
,
上,作
于点D,交
于点E,若
,
.求正方形
的边长;(用含a,h的代数式表示)
(2)操作推理:如何画出这个正方形
呢?
如图②,小杰画出了图①的
,然后又进行以下操作:先在
边上任取一点
,画正方形
,使点
,
在
边上,点
在
内,然后连接
,并延长交
于点N,作
于点M,
交
于点P,
于点Q,得到四边形
.证明:图②中的四边形
是正方形;
(3)拓展应用:在(2)的基础上,在线段
上截取
,连接
,
(如图③),当
时,请直接写出线段
的长.(用含a,h的代数式表示)
(1)温故知识:如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d22f065ec04de109d913e8e7855110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(2)操作推理:如何画出这个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
如图②,小杰画出了图①的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca9581c221aa3016b035444015a7e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da895d8bd043625a0839128252130d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d486055c508b9ff7f79fb8d2a464458b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dacd0086635538bf42d08bfdaf481cb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e2c2bfe8c8337ca8f2fba6af5fddec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
(3)拓展应用:在(2)的基础上,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df7c43dd51ecde238a068b8138e8b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e33bc76f589215d9738bfc3988bfdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2972987740037120/2979393519583232/STEM/a1756d1a-bd5b-4850-b603-4d3b2878a69f.png?resizew=570)
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6 . 在矩形ABCD中,AD,CD边的中点分别为E,F,连接BF,CE交于点G,若
,
,则BG的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1727d703243d23a6f8f403b65ad3a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/6cb9a323-ab28-4cb8-a7eb-441654cde529.png?resizew=175)
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7 . 已知,四边形ABCD是正方形,点G是直线BC上的任意一点,DE⊥AG于点E,BF∥DE,交AG于F.
(1)如图1,当点G在线段BC上时,求证:DE﹣BF=EF;
[拓展延伸]
(2)如图2,当点G在线段CB的延长线上时,线段DE、BF、EF之间存在怎样的数量关系?并说明理由.
(3)如图3,在(2)的条件下,连接AC,过F作FH∥GC,交AC于点H,连接DH,若∠ADE=30°,GB
,求DH的长.
(1)如图1,当点G在线段BC上时,求证:DE﹣BF=EF;
[拓展延伸]
(2)如图2,当点G在线段CB的延长线上时,线段DE、BF、EF之间存在怎样的数量关系?并说明理由.
(3)如图3,在(2)的条件下,连接AC,过F作FH∥GC,交AC于点H,连接DH,若∠ADE=30°,GB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59ac3a4a693a7459d11fb8f7ed12977.png)
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2022-05-12更新
|
123次组卷
|
3卷引用:2022年贵州省铜仁市中考模拟第一次联考数学试题
2022年贵州省铜仁市中考模拟第一次联考数学试题(已下线)专题31 中考几何综合题解答题专项训练-备战2022年中考数学临考题号押题(全国通用)四川省江阳区2023-2024学年八年级下学期期中联考数学试题
8 . 如图,AC是矩形ABCD的一条对角线,将
沿AC翻折后得到
,AE交DC于点F,连接DE.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967959351009280/2974784431939584/STEM/3ea02945-d44a-481b-bae4-d41398c5536c.png?resizew=166)
(1)求证:
;
(2)若
,
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967959351009280/2974784431939584/STEM/3ea02945-d44a-481b-bae4-d41398c5536c.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94350a1d0c263f5d3ba263dbd43178de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
您最近一年使用:0次
9 . 问题背景:已知∠GDH的顶点在边BC所在直线上(不与B,C重合),DG交AB所在直线于点E、DH交AC所在直线于点F.记△BDE的面积为
,△CDF的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646875054080/2971554383740928/STEM/57720214-b799-48cf-a072-a53a80f908e0.png?resizew=683)
(1)初步尝试:如图1,当△ABC是等边三角形.
,
,且
,
时,
.
(2)类比探究:在(1)的条件下,沿BC方向平移∠GDH,使得
,如图2所示位置,则
.
(3)延伸拓展:当△ABC是等腰三角形时,
.
(Ⅰ)如图3当点D在线段BC上运动时,设
,
,
①求证:△BDE∽△CFD.
证明:
∵
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cc7db43b1e3c3255b497507a66610e.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴△BDE∽△CFD.
②直接写出
,
(结果用含m,π,β的三角函数表示).
(Ⅱ)如图4,当点D在BC的延长线上运动时,设
,
,求
的表达式(结果用含m,n,β的三角函数表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646875054080/2971554383740928/STEM/57720214-b799-48cf-a072-a53a80f908e0.png?resizew=683)
(1)初步尝试:如图1,当△ABC是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08420da525b8cf84f7cf202d94cd7b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afedac49ce38f25e0a73e579133afe5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(2)类比探究:在(1)的条件下,沿BC方向平移∠GDH,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(3)延伸拓展:当△ABC是等腰三角形时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d298836e57b7eab140cdb1574fd4ec.png)
(Ⅰ)如图3当点D在线段BC上运动时,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3fd1b54bf975d0e97990247aab714.png)
①求证:△BDE∽△CFD.
证明:
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1d4a059b3ad089f006db5998bce3fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cc7db43b1e3c3255b497507a66610e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴△BDE∽△CFD.
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9207a69d655849e6958adb701e1fda62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(Ⅱ)如图4,当点D在BC的延长线上运动时,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3fd1b54bf975d0e97990247aab714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40a97fd767e95f34f3b91ab8d84c.png)
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10 . 如图,在
中,
,
,
,点O为边AC上的一点,以点O为圆心,半径为6作半圆O,与AC交于点D.
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965953398898688/2968144076537856/STEM/e4a090ed-0dae-4a84-8b28-39ae49767c68.png?resizew=310)
(1)如图1,BC与半圆O相切时,求证AB与半圆O相切;
(2)如图2,点O为AC中点时,将线段CD连同半圆O绕点C旋转.若半圆O与
的直角边相切,设切点为K,连接AK,求AK的长。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965953398898688/2968144076537856/STEM/e4a090ed-0dae-4a84-8b28-39ae49767c68.png?resizew=310)
(1)如图1,BC与半圆O相切时,求证AB与半圆O相切;
(2)如图2,点O为AC中点时,将线段CD连同半圆O绕点C旋转.若半圆O与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
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