如图1,在
外取一点P,作直线
分别交
于B、A两点,先以点P为圆心,
的长为半径画弧,再以点O为圆心,
的长为半径画弧,两弧交于点Q,连接
,交
于点C,连接
.完成下列任务:
与
的位置关系,并说明理由;
(2)如图2,继续作点C关于直线
的对称点D,连接
,交
于点E,连接
.
①若
,则
______
;
②若
的半径为13,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如图2,继续作点C关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73fdf9b92c4a65c9b72903da5bbc54b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3032820a0d2d50d9143e7923f5936ddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
2023·江苏淮安·三模 查看更多[4]
2023年江苏省淮安市涟水县灰墩中学中考三模数学试题2023年江苏省淮安市黄集中学岔河中学中考二模数学模拟试题(已下线)专题08 几何作图问题2-2024年中考数学二轮热点题型归纳与变式演练(江苏专用)2024年宁夏银川市景博学校九年级中考一模数学试题
更新时间:2023-07-02 16:00:19
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相似题推荐
解答题-证明题
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【推荐1】如图,⊙O是△ABC的外接圆,AB为直径, OD∥BC交⊙O于点D,交AC于点E,连接AD,BD,CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/92a0832c-5f03-4286-baca-b6f8af616df0.png?resizew=180)
(1)求证:AD=CD;
(2)若AB=10,cos∠ABC=
,求tan∠DBC的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/92a0832c-5f03-4286-baca-b6f8af616df0.png?resizew=180)
(1)求证:AD=CD;
(2)若AB=10,cos∠ABC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
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【推荐2】如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点.A、B、O、P都是格点.仅用无刻度的直尺在给定网格中完成画图,画图过程用虚线表示.
![](https://img.xkw.com/dksih/QBM/2023/4/8/3212160566378496/3213688483586048/STEM/1a6c4f50032842ebb523733288a5b1f0.png?resizew=251)
(1)在图中
上方作以
为斜边的等腰直角
;
(2)连接
,过O作
,垂足为H;
(3)请你在图中
下方找点Q,使
,且
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d5af85c47a04324701cd91224bfd1e7.png)
![](https://img.xkw.com/dksih/QBM/2023/4/8/3212160566378496/3213688483586048/STEM/1a6c4f50032842ebb523733288a5b1f0.png?resizew=251)
(1)在图中
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484c241af21f8af78b55257ab20196b8.png)
(3)请你在图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3c22b76302c83ea2d23e0bf98258453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c7bbe0ac1c88c9d35978a7184ba553.png)
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【推荐3】阅读以下材料,并按要求完成相应的任务.
在《阿基米德全集》的《引理集》中,记述了古希腊的数学家、物理学家阿基米德提出的六个关于圆的引理,请你根据以下步骤完成其中第二个引理的作图及证明过程.
如图,已知
,
是弦
上一点.
(1)尺规作图(保留作图痕迹,不写作法):
①作线段
的垂直平分线
,分别交
于点
,
于点
,连接
,
;
②以点
为圆心,
长为半径作弧,交
于点
(
,
两点不重合),连接
,
,
.
(2)可得引理的结论为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b188fca5f2a7235c800480a7e0d5bcd.png)
证明:∵
是
的垂直平分线,
∴
.(其依据是________)
∴
,
∴
,
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1338b7ce4ef9febae67e068b81284f.png)
∴
,
∴
,(其依据是________)
∵四边形
是圆的内接四边形,
∴
,(其依据是________)
∵
,
∴
,
∵
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f63db2f3fecd26702209689e1a33e2.png)
∴
.
在《阿基米德全集》的《引理集》中,记述了古希腊的数学家、物理学家阿基米德提出的六个关于圆的引理,请你根据以下步骤完成其中第二个引理的作图及证明过程.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/95d651ce-070d-44f3-9a51-78671b57d9bb.png?resizew=169)
(1)尺规作图(保留作图痕迹,不写作法):
①作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(2)可得引理的结论为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b188fca5f2a7235c800480a7e0d5bcd.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba2f2ea753523c82933a1640389ab17.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23ae4b8e7d4a60f38fc8e87fbc04e7.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1338b7ce4ef9febae67e068b81284f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4d4b0265277a2d62d81323d5308dab.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2889946675fc677b9bfdb65351079c00.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56539deb1f0bfac0f566c6fc4c1b9bab.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f82a0ff71de543f9dcfcaadb8367e5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab262d3a845968088414abeb75e64e9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0600bb5ad244fd5b2bbb8525e56731.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8025652dfb4d45f9cadd35d3d8e16919.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f63db2f3fecd26702209689e1a33e2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b188fca5f2a7235c800480a7e0d5bcd.png)
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【推荐1】如图,四边形ABCD内接于⊙O,BC为⊙O的直径,AC与BD交于点E,P为CB延长线上一点,连接PA,且∠PAB=∠ADB.
(1)求证:PA为⊙O的切线.
(2)若AB=6,tan∠ADB=
,求PB的长.
(1)求证:PA为⊙O的切线.
(2)若AB=6,tan∠ADB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/5c084aad-5fb1-4729-9e28-b08c5a29f3c9.png?resizew=208)
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【推荐2】如图,AB是⊙O的弦,D为OA半径的中点,过D作CD⊥OA交弦AB于点E,交⊙O于点F,且CE=CB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/e218dea4-46a3-4f21-8d15-bf9810329e48.png?resizew=159)
(1)求证:BC是⊙O的切线;
(2)连接AF,BF,求∠ABF的度数;
(3)如果BE=13,
,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/e218dea4-46a3-4f21-8d15-bf9810329e48.png?resizew=159)
(1)求证:BC是⊙O的切线;
(2)连接AF,BF,求∠ABF的度数;
(3)如果BE=13,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c71294f1d752a6369f0d3938942093a.png)
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【推荐1】已知点O是四边形ABCD内一点,AB=BC,OD=OC,∠ABC=∠DOC=α.
(1)如图1,α=60°,探究线段AD与OB的数量关系,并加以证明;
(2)如图2,α=120°,探究线段AD与OB的数量关系,并说明理由;
(3)结合上面的活动经验探究,请直接写出如图3中线段AD与OB的数量关系为 (直接写出答案)
(1)如图1,α=60°,探究线段AD与OB的数量关系,并加以证明;
(2)如图2,α=120°,探究线段AD与OB的数量关系,并说明理由;
(3)结合上面的活动经验探究,请直接写出如图3中线段AD与OB的数量关系为 (直接写出答案)
![](https://img.xkw.com/dksih/QBM/2021/3/21/2682499189350400/2683930156728320/STEM/5bc09d8a-09a6-4ca1-8dfa-5979645e13ff.png?resizew=432)
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【推荐2】如图,在平面直角坐标系xOy中,直线y=﹣
x+m(m>0)与x轴、y轴分别交于点A、B.过点A的直线y=kx+4(k<0)与y轴交于点C,∠OCA=∠OAB.
(1)求直线AB的表达式;
(2)点D是x轴上一动点,当△ABD与△ABC相似时,求点D坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求直线AB的表达式;
(2)点D是x轴上一动点,当△ABD与△ABC相似时,求点D坐标.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853120585179136/2854420725325824/STEM/4354876670234c5aa5b08aed8b13b98e.png?resizew=203)
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【推荐1】下面是“过圆外一点作圆的切线”的尺规作图过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0fab3064-30c4-4f28-ac65-751f3bf7d86f.png?resizew=324)
已知:如图1,
和
外一点
.
求作:过点
的
的切线.
作法:如图2,
①连结
,作线段
的中点
;
②以
为圆心,
的长为半径作圆,交
于点
;
③作直线
和
,直线
即为所求作
的切线.
请在图2中补全图形,并完成下面的证明.
证明:连接
,如图2,
由作法可知,
为
的直径,
∴
(_____________)(填推理的依据),
∴
,
∵点
在
上,
∴直线
是圆的切线(_____________)(填推理的依据),
同理,直线
也是圆的切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/0fab3064-30c4-4f28-ac65-751f3bf7d86f.png?resizew=324)
已知:如图1,
![](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/dad2a36927223bd70f426ba06aea4b45.png)
求作:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
作法:如图2,
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
②以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
③作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
请在图2中补全图形,并完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
由作法可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cb63baebf41b577040d7cdd8e45a1b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb2b741b79d32f985bf55cf6a8e6422.png)
∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
同理,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图1,小明在
外取一点P,作直线
分别交
于两点B、A,先以P为圆心
的长为半径画弧,再以O为圆心
的长为半径画弧,两弧相交于点Q,连接
交
于点C,连接
.完成下列任务:
为
的切线的核心依据:__________________;
(2)如图2,继续作点C关于
的对称点D,连接
交
于点E,连接
.
①求证:
;
②若
的半径为15,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73be30f639b301cf797d6e8d04a568d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73be30f639b301cf797d6e8d04a568d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d57c5366753582457cc87de6e90b302.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)如图2,继续作点C关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4174767ebf7b8f0dab72049c04f5fe.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80b71495d98dd3533905407bf31ce23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
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