如图,
是
的外接圆,
.D是
上一点,连接
,与
交于点F,点E在
的延长线上.
与
相切;②
;③
这三个信息中,选择两个作为条件,剩余的一个作为结论构成一个命题.试写出你所构造的命题,判断命题是否正确,并说明理由;
你选择的条件是 , ;结论是 .(只要填写序号)
(2)在(1)的条件下,若
,
,求
的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6344f71dcbc7083f7824b2097ebcdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
你选择的条件是 , ;结论是 .(只要填写序号)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63367b1d9c4f1c3e989ed5d881d0e3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2024-05-27 16:06:39
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相似题推荐
解答题-证明题
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【推荐1】如图,点P是正方形
内一点,点P到点A,B和D的距离分别为1,
,
.
沿点A旋转至
,连接
,并延长
与
相交于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/b21e5f67-5ed0-46cf-aa2b-1b96e6db5eb0.png?resizew=148)
(1)求证:
是等腰直角三角形.
(2)求
的大小.
(3)求正方形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f8c0c8a16d9e56d7db6a9d8657faf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/b21e5f67-5ed0-46cf-aa2b-1b96e6db5eb0.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2f90f1f950f19b10ee0b1852cec730.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
(3)求正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】【概念呈现】:
当一个凸四边形的一条对角线把原四边形分成两个三角形.若其中有一个三角形是等腰直角三角形,则把这条对角线叫做这个四边形的“等腰直角线”,把这个四边形叫做“等腰直角四边形”;当一个凸四边形的一条对角线把原四边形分成两个三角形,若其中一个三角形是等腰直角三角形,另一个三角形是等腰三角形,则把这条对角线叫做这个四边形的“真等腰直角线”,把这个四边形叫做“真等腰直角四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f447478a-5687-473a-a16a-42490eb9540f.png?resizew=381)
(1)【概念理解】如图①,若
,
,
,则四边形
__________(填“是”或“否”)真等腰直角四边形;
(2)【性质应用】如图①,如果四边形
是真等腰直角四边形,且
,对角线
是这个四边形的真等腰直角线,当
,
时,
__________;
(3)【深度理解】如图②,四边形
与四边形
都是等腰直角四边形,且
,
,
,对角线
、
分别是这两个四边形的等腰直角线,试说明
与
的数量关系,并说明理由.
当一个凸四边形的一条对角线把原四边形分成两个三角形.若其中有一个三角形是等腰直角三角形,则把这条对角线叫做这个四边形的“等腰直角线”,把这个四边形叫做“等腰直角四边形”;当一个凸四边形的一条对角线把原四边形分成两个三角形,若其中一个三角形是等腰直角三角形,另一个三角形是等腰三角形,则把这条对角线叫做这个四边形的“真等腰直角线”,把这个四边形叫做“真等腰直角四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f447478a-5687-473a-a16a-42490eb9540f.png?resizew=381)
(1)【概念理解】如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a2f4950d53dd29233016737c45cb6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)【性质应用】如图①,如果四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f92336571fa2d98813029b8c3c8a6f0.png)
(3)【深度理解】如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19aee2a7549f958e28f7136178e4eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】已知AB是半圆O的直径,M,N是半圆上不与A,B重合的两点,且点N在
上.
(1)如图1,MA=6,MB=8,∠NOB=60°,求NB的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/88fc9b2b-29c8-4edf-ab5e-b40c190a7826.png?resizew=140)
(2)如图2,过点M作MC⊥AB于点C,P是MN的中点,连接MB,NA,PC,试探究∠MCP,∠NAB,∠MBA之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610a137e7fd2a86c4a1b98f279a71962.png)
(1)如图1,MA=6,MB=8,∠NOB=60°,求NB的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/88fc9b2b-29c8-4edf-ab5e-b40c190a7826.png?resizew=140)
(2)如图2,过点M作MC⊥AB于点C,P是MN的中点,连接MB,NA,PC,试探究∠MCP,∠NAB,∠MBA之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/c5280ce8-cf20-46d6-922a-bceacdc8f5bd.png?resizew=148)
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解答题-作图题
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【推荐2】如图,
的弦
垂直于直径
,交半径
于E,连接
,
.尺规作图 :过点B作
,交
于点F;(保留作图痕迹,不必写作法)
(2)在(1)的条件下,若
,
,求
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.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/dff21fa5add663a1e31ab4bdf50bb6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐1】如图,
为
的直径,弦
于E,
,交
的延长线于F,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0a90245c-2125-4efb-9b9a-1ef1ccbe6cc9.png?resizew=188)
(1)求证:
为
的切线;
(2)若
,求
、
、弧
围成的阴影部分的面积.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9637000a187c45183791bfc6ee7789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20befb31b8e0deb0604491ab8ab7cd7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/0a90245c-2125-4efb-9b9a-1ef1ccbe6cc9.png?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af9774200946261f0ccba3e6eeba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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解答题-作图题
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【推荐2】如图,在
中,
,D是
中点.
为直径作
,交
于点E(保留作图痕迹,不需写作法);
(2)求证:
是
的切线;
(3)若
,
,求O到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐1】如图,点D、E分别是△ABC边BC、AB上的点,AD、CE相交于点G,过点E作EF∥AD交BC于点F,且
,联结FG.
(1)求证:GF∥AB;
(2)如果∠CAG=∠CFG,求证:四边形AEFG是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43f32bb775a1168537630ee01688eb2.png)
(1)求证:GF∥AB;
(2)如果∠CAG=∠CFG,求证:四边形AEFG是菱形.
![](https://img.xkw.com/dksih/QBM/2017/4/28/1675374076133376/1676583830159360/STEM/1e36a97900424e4c87decec6636ebdbf.png?resizew=223)
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【推荐2】如图,AB是半⊙O的直径,点D是圆弧AE上一点,且∠BDE=∠CBE,点C在AE的延长线上.
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926140254994432/2941060068376576/STEM/9f075444b6bb48209bac4773b7f7bd66.png?resizew=143)
(1)求证:BC是⊙O的切线;
(2)若BD平分∠ABE,延长ED、BA交于点G,若CA=AO,DE=5,求GD的长.
![](https://img.xkw.com/dksih/QBM/2022/2/28/2926140254994432/2941060068376576/STEM/9f075444b6bb48209bac4773b7f7bd66.png?resizew=143)
(1)求证:BC是⊙O的切线;
(2)若BD平分∠ABE,延长ED、BA交于点G,若CA=AO,DE=5,求GD的长.
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