如图,
中,
,以
为直径作
,与边
交于点
,过点
的
的切线交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/011bd928-97b2-482f-9954-c0a5de177ae7.png?resizew=164)
(1)求证:
;
(2)若
,
,求
的长.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/011bd928-97b2-482f-9954-c0a5de177ae7.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe957337517d6ef00c9e6fd59c49d0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9938f4e86299b789840a58159eb9527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
2023·北京房山·一模 查看更多[5]
2023年北京市房山区中考一模数学试卷2023年安徽省蚌埠市龙子湖区三校联合中考二模数学试题泸科版九年级下册第24章圆单元测试数学试题2023年山东省济宁市泗水县中考三模数学试题(已下线)专题19 圆的有关计算与证明(共57题)-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(北京专用)
更新时间:2023-04-29 16:27:36
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解答题-证明题
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【推荐1】如图,在平行四边形ABCE中,连接AC,做△ABC的外接圆⊙O,延长EC交⊙O于点D,连接BD、AD,BC与AD交于点F,∠ABC=∠ADB,
(1)求证:AE是⊙O的切线;
(2)若AE=12,CD=10,求⊙O的半径.
(1)求证:AE是⊙O的切线;
(2)若AE=12,CD=10,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2019/3/16/2161787379286016/2165255181615105/STEM/076d35f30ff9445da1fbb44557c82de7.png?resizew=172)
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【推荐2】如图,
,
,
,
在以
为直径的
上,
与
的延长线交于点
,过点
作
的切线
交
于点
,
.
;
(2)若
,
.求
的值.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a5dd105a17db8f79f116000b575198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐1】如图,AB为
的直径,点C在
上,连接AC,BC,过点O作
于点D,过点C作
的切线交OD的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892417537515520/2895005367017472/STEM/651cd7ae-7e36-4684-a855-c29eedbafd37.png?resizew=229)
(1)求证:
;
(2)连接AD.若
,
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662cc3b6a02005be45bb931c08d0ecbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892417537515520/2895005367017472/STEM/651cd7ae-7e36-4684-a855-c29eedbafd37.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d248fbf81ddef9b58eeba0ee948954.png)
(2)连接AD.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff6596ca12232d5565fc2a3948360a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e34f3fbb1adf23cf81d7005f4387a6.png)
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【推荐2】如图所示,在
中,
,以直角边
为直径作
,交斜边
于点D,连结
.
,求
的值;
(2)过点D作
的切线,交
于点E,求证:E是
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f9215613b7b05217ed77268c238391.png)
(2)过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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真题
【推荐1】如图,D为⊙O上一点,点C在直径BA的延长线上,且∠CDA=∠CBD.
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573680434479104/1573680440958976/STEM/0638a676ae2249358d347f10547c428d.png)
(1)求证:CD2=CA•CB;
(2)求证:CD是⊙O的切线;
(3)过点B作⊙O的切线交CD的延长线于点E,若BC=12,tan∠CDA=
,求BE的长.
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573680434479104/1573680440958976/STEM/0638a676ae2249358d347f10547c428d.png)
(1)求证:CD2=CA•CB;
(2)求证:CD是⊙O的切线;
(3)过点B作⊙O的切线交CD的延长线于点E,若BC=12,tan∠CDA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8b45edad1f59a7454739675fd2de55.png)
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【推荐2】如图,在
中,点D,E分别在边AB,AC上,连接DE,且
.
(1)求证:
ADE∽
ACB;
(2)若∠B=55°,∠ADE =75°,求∠A的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c5b29830e23ed86d888bb361c35147.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)若∠B=55°,∠ADE =75°,求∠A的度数.
![](https://img.xkw.com/dksih/QBM/2021/1/18/2639014146097152/2640835434618880/STEM/8c9b15e9-e745-4ec3-b544-a15e1e14d8fb.png)
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解答题-作图题
|
适中
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【推荐1】如图,
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852664086413312/2856950398812160/STEM/4fd0cd2894534d509fe5ae1e54cc3c19.png?resizew=229)
(1)尺规作图:在
上求作
点,使得
;
(2)在(1)条件下,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://img.xkw.com/dksih/QBM/2021/11/16/2852664086413312/2856950398812160/STEM/4fd0cd2894534d509fe5ae1e54cc3c19.png?resizew=229)
(1)尺规作图:在
![](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/aac2fba5cc3ed36e0be1e1e2cdfa7ec0.png)
(2)在(1)条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
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解答题-证明题
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【推荐2】如图,在
中,
,点
是
上一点,以
为半径,
与
相交于点
,与
相切于点
,连结
.
(1)求证:
平分
;
(2)已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1975070c24ab281f23cd02fa360ef892.png)
,
,求
的半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/67215087-e9d1-430f-a75e-de629a7201ff.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1975070c24ab281f23cd02fa360ef892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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