在《阿基米德全集》中的《引理集》中记录了古希腊数学家阿基米德提出的有关圆的一个引理:如图1,
是
的弦,点P在
上,
于点C,点D在弦
上且
,在
上取一点Q,
,连接
,则
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/8cc96561-7f14-437a-862a-1e2a59a5b396.png?resizew=425)
(1)如图2,小亮尝试说明
,于是他连接了
,
,
,
.请你帮助他完成下列证明.
①求证:
;
②求证:
.
(2)如图3,将材料中的“弦
”改为“直径
”,作直线l与
相切于点Q.过点P作
直线l于点G,其余条件不变,连接
,
.若
,
,求
的半径
的长
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236e8737e7856627067c0a9606635f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82331b038cff2732788d3b5b02a9891c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25d389aca49575c2147b41b688385c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/8cc96561-7f14-437a-862a-1e2a59a5b396.png?resizew=425)
(1)如图2,小亮尝试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25d389aca49575c2147b41b688385c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb33d148ce13b3fdee1994e60ba830e.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25d389aca49575c2147b41b688385c6.png)
(2)如图3,将材料中的“弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/c5354678a1506d618705514de0f09535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d06207fe84557ce823b9b746660b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053e24bc20dba64da28d8a4d6a329b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
2023·河南洛阳·一模 查看更多[3]
(已下线)2023年河南省洛阳市宜阳县九年级第一次学情诊断数学试题(已下线)专题17 圆综合题-学易金卷:2023年中考数学一模试题分项汇编(全国通用)河南省洛阳市宜阳县2022-2023学年九年级下学期第一次学情诊断数学试题
更新时间:2023-03-29 14:25:43
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,AB=AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/ab1f7399-5647-4452-a415-8296d664d6f1.png?resizew=136)
(1)用尺规完成作图:作AB的垂直平分线交AC于E,垂足为D,连接BE.(不写作法,保留作图痕迹).
(2)若
,求
的度数.
(3)若
的周长为24,AB=14,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/ab1f7399-5647-4452-a415-8296d664d6f1.png?resizew=136)
(1)用尺规完成作图:作AB的垂直平分线交AC于E,垂足为D,连接BE.(不写作法,保留作图痕迹).
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52459d2cf85be6684f93828daeb7a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0efaac768905d14cb070b4806edf8c.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,D是
边上一点,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983501254426624/2985603881828352/STEM/1ffc3f93-d657-4e65-9a7d-774d6f7da059.png?resizew=221)
(1)尺规作图(保留作图痕迹,不写作法);
①作
的角平分线交
于点E;
②作线段
的垂直平分线交
于点F.
(2)
的角平分线与线段
的垂直平分线交于点O.连接
、
,请猜想
和
的数量关系并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab0389bef7fea9fd2429966ef6bf2d8.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983501254426624/2985603881828352/STEM/1ffc3f93-d657-4e65-9a7d-774d6f7da059.png?resizew=221)
(1)尺规作图(保留作图痕迹,不写作法);
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,
是⊙
的切线,切点为B,
交⊙
于点C,过点C的切线交
于点D,若
.求⊙
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.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/751fdec145bc7652f00874cb24196f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/10/18/2832181243879424/2834005474058240/STEM/0f24026f-a028-4e6e-af41-bde1b9067725.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知△ABC内接于⊙O,AB为⊙O的直径,AC的延长线上有点D,AC=3CD,连接BD,E为BD的中点,CE是⊙O的切线.
(1)求证:BD与⊙O相切;
(2)求∠ACE的度数.
(1)求证:BD与⊙O相切;
(2)求∠ACE的度数.
![](https://img.xkw.com/dksih/QBM/2018/9/28/2042303741034496/2045173638742016/STEM/f5e8edf899c74b46869904afc4f1ca07.png?resizew=139)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图1,
中,
,
.点D在
上,且
.点E在
上,过C、D,E三点的
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/113bb6db-09a4-4add-a0b7-ae0d8504a164.png?resizew=250)
(1)
______°;
(2)若
,求
的长;
(3)如图2,若点E为
的中点,求四边形
的面积S.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30f9b7a6123f13fa0793ead76dc651a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/113bb6db-09a4-4add-a0b7-ae0d8504a164.png?resizew=250)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88504784a3def38879c4e46458acfee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
(3)如图2,若点E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e4e053b8fde522a49ae306f9f165b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图在⊙O中,BC=2,AB=AC,点D为AC上的动点,且cosB=
.
(1)求AB的长度;
(2)求AD•AE的值;
(3)过A点作AH⊥BD,求证:BH=CD+DH.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83fb9ac8a18e78a4c56da79514b5ccb.png)
(1)求AB的长度;
(2)求AD•AE的值;
(3)过A点作AH⊥BD,求证:BH=CD+DH.
![](https://img.xkw.com/dksih/QBM/2019/3/13/2159694041956352/2165975334191104/STEM/09c77253aef34765b6a2f4af4ebfeca3.png?resizew=238)
您最近一年使用:0次