如图,AB是⊙O的直径,点C是⊙O上一点(与点A,B不重合),过点C作直线PQ,使得∠ACQ=∠ABC.
(1)求证:直线PQ是⊙O的切线.
(2)过点A作AD⊥PQ于点D,交⊙O于点E,若⊙O的半径为2,sin∠DAC=
,求图中阴影部分的面积.
(1)求证:直线PQ是⊙O的切线.
(2)过点A作AD⊥PQ于点D,交⊙O于点E,若⊙O的半径为2,sin∠DAC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/7d8205cd-0ee4-4662-a79a-9335001caf18.png?resizew=160)
2020·贵州黔东南·中考真题 查看更多[19]
贵州省黔东南州2020年中考数学试题(已下线)第25讲 与圆有关的计算与证明 (测)-2021年中考数学一轮复习讲练测2021年山东省临沂市费县中考一模数学试题山东省枣庄市峄城区2020-2021学年九年级下学期期中质量监测数学试题(一模)(已下线)【万唯原创】2021年广东试题研究-练册-第六章3(已下线)【万唯原创】2021年河北试题研究-练册-第一部分第六章圆42021年湖北省樊城区中考适应性考试数学二模试题甘肃省张掖市临泽县2020-2021学年九年级下学期期中数学试题2022年广东省(省考卷)中考数学模拟考试题2021年山东省枣庄市台儿庄区九年级下学期第一次调研数学试卷2022年山东省枣庄四十一中中考数学一模试题2021年云南省玉溪市新平县初中学业水平考试数学模拟试题2021年江苏省扬州市江都实验中学中考数学三模试题 2022年内蒙古呼伦贝尔市阿荣旗中考二模数学试题2022年贵州省毕节市织金县九年级第三次诊考数学试题2022年黑龙江省齐齐哈尔富拉尔基区九年级三模数学试题2022年广东省东莞市中考一模数学试卷广东省汕头市翠英中学2022-2023学年九年级下学期第一阶段质量评估数学试题云南省红河哈尼族彝族自治州蒙自市2021-2022学年九年级上学期期末数学试题
更新时间:2020-07-01 20:20:59
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【推荐1】菱形ABCD中,∠ABC=60°,△BEF为等边三角形,将△BEF绕点B顺时针旋转,M为线段DF的中点,连接AM、EM.
(2)将△BEF旋转至如图2所示位置,(1)中的结论是否仍成立?若成立,请证明;若不成立,请说明理由;
(3)若AB=2
,EF=1,在旋转过程中,CM的最小值为______,此时DF的长为______.
(2)将△BEF旋转至如图2所示位置,(1)中的结论是否仍成立?若成立,请证明;若不成立,请说明理由;
(3)若AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】如图所示,在平行四边形ABCD中,∠DAC=60°,点E是BC边上一点,连接AE,AE=AB,点F是对角线AC边上一动点,连接EF.
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703894485368832/2704377493635072/STEM/cf322ff7-abcf-4405-a812-a17c0602d58a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703894485368832/2704377493635072/STEM/7ca82e08-06d2-4021-8ca1-ac6289739a86.png?resizew=175)
(1)如图1,若点F与对角线交点O重合,已知BE=4,OC:EC=5:3,求AC的长度;
(2)如图2,若EC=FC,点G是AC边上一点,连接BG、EG,已知∠AEG=60°,∠AGB+∠BCD=180°,求证:BG+EG=DC.
(3)如图3,若BE=4,CE=
,将EF绕点E逆时针旋转90°得EF′,请直接写出当AF′+
BF′取得最小值时△ABF′的面积.
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703894485368832/2704377493635072/STEM/cf322ff7-abcf-4405-a812-a17c0602d58a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703894485368832/2704377493635072/STEM/7ca82e08-06d2-4021-8ca1-ac6289739a86.png?resizew=175)
(1)如图1,若点F与对角线交点O重合,已知BE=4,OC:EC=5:3,求AC的长度;
(2)如图2,若EC=FC,点G是AC边上一点,连接BG、EG,已知∠AEG=60°,∠AGB+∠BCD=180°,求证:BG+EG=DC.
(3)如图3,若BE=4,CE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f83dbfddc6f98548699ed581e8c8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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【推荐1】如图,AB是⊙O的直径,∠ACB的平分线交AB于点D,交⊙O于点E,过点C作⊙O的切线CP交BA的延长线于点P,连接AE.
(1)求证:PC=PD;
(2)若AC=6cm,BC=8cm,求线段AE、CE的长.
(1)求证:PC=PD;
(2)若AC=6cm,BC=8cm,求线段AE、CE的长.
![](https://img.xkw.com/dksih/QBM/2019/1/1/2109366936174592/2110291513581568/STEM/1e56e222a3b2483eb1499efb66e723cd.png?resizew=158)
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【推荐2】已知
四点在
上,弦
与直径
相交于点E,
,点P为射线
上一点,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/61834a51-cff7-4e86-ae80-516273042f7a.png?resizew=221)
(1)求证:
为
的切线;
(2)若
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea1a1a3d4a276dd5a1f299cbcda7329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c231c1150e27c34eb787a46b02ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/61834a51-cff7-4e86-ae80-516273042f7a.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e80edbded06cfe196931602c17fb96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe18fff29dec28e419294cbee8f2852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e67eed6dc9258d030a7c241b7789c963.png)
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【推荐1】如图①,
是
的直径,
,点
在
上且位于直线
上方,将半径
绕点
顺时针旋转
,点
的对应点为点
,连结
,
.
为边的
内接正多边形的边数为________;
(2)当直径
平分
时,求
的长;
(3)连结
,当
时,求
的长;
(4)如图②,连结
并延长,交
的延长线于点
,当
是等腰三角形时,直接写出扇形
的面积.
![](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/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
(3)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3031a378e982dbb72483367c52e815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(4)如图②,连结
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06bf006d9cf9568dd567c25fd20a0c85.png)
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【推荐2】如图1,扇形OAB的半径为12,∠AOB=90°,P是半径OB上一动点,Q是弧AB上的一动点.连接PQ.
(1)当
度时,
有最大值,最大值为___________;
(2)如图2,若
是
中点,且
于点
.则
的长为
;(结果保留
)
(3)如图3,将图形
沿折痕
折叠,使点
的对应点
恰好落在
的延长线上,求阴影部分面积.(结果保留
)
(4)如图4,将扇形
沿
折叠,使折叠后的
与半径
相交与
、
两点.若
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/6c956415-6e35-4b1d-9ced-02aa93461677.png?resizew=584)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40026e2a2abea494be587171a6f2ac13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62e8aadaadebf1454fde21a390ebdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259e225df354d605e05372a0fd5ce033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67a04dba3e66ee26e57fb0039ef779ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fb32a03264151340401a243118d973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2d1ecae9c649cc3c89f9ce0c063208.png)
(3)如图3,将图形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571f8dfb1eb003438f27bab2324140ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2d1ecae9c649cc3c89f9ce0c063208.png)
(4)如图4,将扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a44aa6beb0b8948618d252e7b765de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae36314ca69c5f6572d7d2922647ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7a3e520a16d4fdd73c4e6a4ce7be0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d08196b8516e5a5f47b230de813fb59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
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【推荐1】如图,在正方形
中,
为线段
上的动点(不含端点
),将
沿着
翻折得到
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/c67f14e1-108f-4568-a7c0-bd33e7b295a4.png?resizew=553)
(1)如图1,当
,求
长;
(2)如图2,
为线段
上的点,当
时,求点
由
到
的运动过程中,线段
扫过的图形与
重叠部分的面积;
(3)如图3,
在
上,连接
,将
沿着
翻折得到
,连结
,问是否存在点
,使得
与
相似?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3775a910dc0f94a03a7444398f7b49b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd51caff8d6cd6d3478fb4659789d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ce15d6393bd3bfd96fa6837d70d872.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/c67f14e1-108f-4568-a7c0-bd33e7b295a4.png?resizew=553)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79fcc16580d7ceeff26780b4ccb014c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
(2)如图2,
![](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/1b538e72e09c41af626f1c626f4752d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a4553af74c05de69b65a5faffaf39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7048a2fee2ba929f1c5b0e61aadd88ed.png)
(3)如图3,
![](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/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13801b318bb3efbd62f34c1e814e88b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1651c45381f183a3caa2a201bf57ecc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbac5db9900d255c00922812b40fcd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52cb9079f5ff1ef044a4524b25d6f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10181c7da1ebde87bf7b9c5fcde65c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】如图1,
中,
,
,点
为斜边
的中点,点
是线段
上的动点,点
关于直线
对称点为点
,连接
,连接
.
为等边三角形,
的大小为________;
(2)如图2,延长
,交射线
于点
,
大小是否发生变化?若不变,请求出
的大小:若变化,请说明理由.
(3)如图2,
,点
由点
运动至点
的过程中,
的面积最大值为________,
扫过的面积为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0a272aa29c4531aac22f28c64baf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0a272aa29c4531aac22f28c64baf5.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd9311e5295f10061deb2872fe04af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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