如图,点
,
,
,
,
,
分别在
上,
,
,连接
,
.
与
全等吗?为什么?
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf857e03d4320c999d328fd657c2d412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/12aecc3b-6570-4755-ac28-b8132815403f.png?resizew=147)
21-22九年级上·全国·课后作业 查看更多[2]
(已下线)【冀教版】九年级上册第二十八章 圆 28.3 圆心角和圆周角 第一课时 圆心角(已下线)2.2 圆的对称性(一)圆心角、弧、弦的关系-2021-2022学年九年级数学上册链接教材精准变式练(苏科版)
更新时间:2021-09-13 20:41:22
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相似题推荐
解答题-证明题
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【推荐1】如图,在
和
中,
与
相交于点O,
,
.
(1)求证:
;
(2)求证:
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.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/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/02f387d3-f8a2-4ef8-b5c9-536fd0402743.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50834e39c4e028e0fc303b94d571923.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
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解答题-作图题
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名校
【推荐2】尺规作图:
已知:
.
求作:
内部一点P以及线段
和
,使得
于点E,
于点F且
.
作法:
①以O为圆心,适当长为半径作弧,交
于M,交
于N;
②分别以M,N为圆心,大于
的长为半径作弧,两弧在
的内部交于点C;
③作射线
;
④在射线
上取一点P(不与点O,C重合),过点P作
于点E,
于点F.
请根据尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101946892345344/3156199674519552/STEM/f798a55a6330487881b3d7bc5d350b5b.png?resizew=136)
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下列证明.
证明:连接
.
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70115e1cfff4b0e34b2b30eb8d1ce5ff.png)
∴
.(________)(填推理依据)
∴
.(________________________________)(填推理依据)
∴射线
平分
.
∵点P在
的平分线OC上,且
于点E,
于点F,
∴
(________________________________)(填推理依据)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30155e0e3cf7c5146d3311e5b8da93.png)
作法:
①以O为圆心,适当长为半径作弧,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
②分别以M,N为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
③作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
④在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
请根据尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101946892345344/3156199674519552/STEM/f798a55a6330487881b3d7bc5d350b5b.png?resizew=136)
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下列证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c01f0de240f8f0e6a10310ab23ae0748.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699ccb1d8c438f5bc838cd3c55dacda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0aac4eb03ed57830e5188a218de064d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70115e1cfff4b0e34b2b30eb8d1ce5ff.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2b515eaf8149d940aa5d0e8e7dca34.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac19b08496ce605f9ac0d4e56a6950b2.png)
∴射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
∵点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f28bf169525eddd3459069a9b5c0d74.png)
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【推荐3】【阅读理解】画一条水平数轴,记为x轴,以原点O为圆心,过x轴上的每一刻度点画同心圆,过原点O按逆时针方向画与x轴正半轴的角度分别为
、
、
、
、
、…、
的射线,这样就建立了“圆”坐标系.如图,在建立的“圆”坐标系内,我们可以将点A、B、D的坐标分别表示为
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/58d21360-8361-41cb-8a06-cc89e5393b47.png?resizew=257)
【问题探究】
(1)如图点C、E的坐标分别表示为______;
(2)在“圆”坐标系内描出点
、
,连接AB、FG,试说明
;
(3)若
是等边三角形,则点P的坐标为______;
(4)若在“圆”坐标系中,不在x轴上的点
与点
关于x轴对称,则
与
、
与
分别满足的数量关系是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8f3a8b0608ec011ad95c522fd2ea4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376ec7b441a398b39258f580cff27a19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80efd89064a881aba557e6987d32cd9e.png)
![](https://img.xkw.com/dksih/QBM/2024/1/23/3417153820884992/3418941683638272/STEM/b5a29213e81b4dde9b4dc405ee4b6b56.png?resizew=51)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc2120537584ae32481a7d50dee35d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/58d21360-8361-41cb-8a06-cc89e5393b47.png?resizew=257)
【问题探究】
(1)如图点C、E的坐标分别表示为______;
(2)在“圆”坐标系内描出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e125ba8f1b9914cfb6abe5cc552424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670f22df2038bed9b521f4761f26df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e51e89f9d81ef8acb4c43cde1528d0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532d9de08698f61d7c010805c61a4ec5.png)
(4)若在“圆”坐标系中,不在x轴上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793894c733026e3f5900b31538fcb731.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2dff006a89ed43e44492206e8516e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
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解答题-问答题
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【推荐1】如图,
是⊙
的直径,
、
是半⊙
的三等分点,
于点
,求
的度数并指出
与
的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7286c442984e33bb52eada93d71c4128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ef137d7c5ac8def31d9aef6c962397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://img.xkw.com/dksih/QBM/2023/1/27/3161981200408576/3163846928654336/STEM/c208bcadd8df48ad9b264833ed55d5cf.png?resizew=137)
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【推荐2】已知AB是⊙O的直径,点C在AB的延长线上,AB=4,BC=2,P是⊙O上半部分的一个动点,连接OP,CP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/8ed4d644-2795-49ef-bd17-9228226608ba.png?resizew=465)
(1)如图①,△OPC的最大面积是________;
(2)如图②,延长PO交⊙O于点D,连接DB,当CP=DB时,求证:CP是⊙O的切线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/8ed4d644-2795-49ef-bd17-9228226608ba.png?resizew=465)
(1)如图①,△OPC的最大面积是________;
(2)如图②,延长PO交⊙O于点D,连接DB,当CP=DB时,求证:CP是⊙O的切线.
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