如图,锐角
内接于
,射线
经过圆心O并交
于点D,连结
,
,
与
的延长线交于点F,
平分
.
![](https://img.xkw.com/dksih/QBM/2024/2/20/3437011397730304/3441339149189120/STEM/df717a28a73c4544a26e2f50d3d94017.png?resizew=238)
(1)求证:
.
(2)若
,
的半径为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://img.xkw.com/dksih/QBM/2024/2/20/3437011397730304/3441339149189120/STEM/df717a28a73c4544a26e2f50d3d94017.png?resizew=238)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bf36e5cd56e22f5d5458932b126209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
更新时间:2024-02-27 14:55:38
|
相似题推荐
解答题-证明题
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真题
【推荐1】如图,AB是⊙O的直径,弦CD⊥AB于点E,点P在⊙O上,PB与CD交于点F,∠PBC=∠C.
(1)求证:
;
(2)若∠PBC=22.5
,⊙O的半径R=2,求劣弧AC的长度.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe2c3fe338623f8b45c4f5deb7f50cd.png)
(2)若∠PBC=22.5
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573742630232064/1573742635810816/STEM/284bdf94-9a81-41b6-8e10-1edce9308e82.png?resizew=190)
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【推荐2】如图,在
中,
是
边上的高,以
为直径的
交
于点F,交
于点E,连结
.
;
(2)若
,
的直径为5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594cbbbf2bb8b64f85ab4c253d800341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f51c2d2150cfbc687da8cb21e726bed7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
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(0.65)
【推荐1】已知四边形
是
的内接四边形,延长
,延长线
与边
组成的角
即为
的内接四边形
的一个外角,
称为外角
的“内对角”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/d0e75384-96f9-4d3e-80ea-a0d085257fbc.png?resizew=148)
(1)当
时,求
的度数.
(2)由(1)的结果你能猜想出什么结论?并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/d0e75384-96f9-4d3e-80ea-a0d085257fbc.png?resizew=148)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7013cc4303c7ac5d0f03c85423f0c258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)由(1)的结果你能猜想出什么结论?并证明你的猜想.
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解答题-作图题
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名校
【推荐2】如图,点A、B、C在
上,
.请仅用无刻度的直尺分别按下列要求画图.(保留画图痕迹,不写画法)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/a90a31f0-d3fc-48b6-a791-374541d7ec8d.png?resizew=252)
(1)在图①中,作一个度数为
的圆周角:
(2)如图2,
为
的外接圆,直线l与
相切与点P,且
,在图2中画出一条弦 ,使这条弦 将
分成面积相等的两部分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8c8f253f09af73cdf85b8efb1d60d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/a90a31f0-d3fc-48b6-a791-374541d7ec8d.png?resizew=252)
(1)在图①中,作一个度数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad36099d4f257b472895e2c5209ea286.png)
(2)如图2,
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a1eb9d682e2bd181f3b0f5115160b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐1】人教版教材中的折纸活动,引起了许多同学的兴趣.在折纸的过程中,同学们不仅发展了空间观念,还积累了数学活动经验.
【操作】在矩形
中,
,点E在边
上,连接
,将
沿
折叠,点B的对应点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/ee910c41-67f7-4ef8-a48b-771ab555901d.png?resizew=353)
【发现】
(1)如图1,若点M,
,E在同一条直线上,求证:
为等腰三角形;
【探究】
(2)若点落在矩形对角线上,求
的长;
【拓展】
(3)如图2,过点
作
,当
面积最大时,请直接写出
的长.
【操作】在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc5840a6d28b6eeb4caed7d5e11ffd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/ee910c41-67f7-4ef8-a48b-771ab555901d.png?resizew=353)
【发现】
(1)如图1,若点M,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b100429009a720f571a31c3a23d6ba.png)
【探究】
(2)若点落在矩形对角线上,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【拓展】
(3)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7d034584d26c57b85067af05b30aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7395b0abf90241e101e6528a655973f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解题方法
【推荐2】有这样一道题:已知:如图(1),点
在
内部,连
,
,
,点
,
,
分别在
,
,
上,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222636098543616/2223451401822208/STEM/bb5712ae747148b2b06a1709d2515c68.png?resizew=392)
(1)求证:
∽
;
(2)若将这题图(1)中的点
移到
外,如图(2),其他条件不变,试 问:
与
有何关系?请你完成图(2),写出你的结论(不需证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.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/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043bd614be04d2a77a4eb2736606d56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b12aa9d4f934868c3e4f51f73e7c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e846210a47c377cdba8a8aafbea79c79.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222636098543616/2223451401822208/STEM/bb5712ae747148b2b06a1709d2515c68.png?resizew=392)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若将这题图(1)中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知
是等边三角形,
,点
在
上,
,
是
的外角平分线,连接
并延长与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/667611b3-c7ed-4ce4-b306-42729aa1eec1.png?resizew=277)
(1)求
的长;
(2)求
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42b730d87bb95763a48c69f1b0329ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/667611b3-c7ed-4ce4-b306-42729aa1eec1.png?resizew=277)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cd9d0d73549e2944578f3513631ce5.png)
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【推荐2】已知
是
的直径.
和
是
的两条切线,
与
相切于点E,分别交
、
于D、C两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/6db9f122-f01f-4cb1-a77e-5fc2c40f9af7.png?resizew=360)
(1)如图1,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dbe7369f07fda5becf396f1dcff395.png)
(2)如图2,连接
并延长交
于点F,连接
,若
,
,求图中阴影部分的面积.
![](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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/6db9f122-f01f-4cb1-a77e-5fc2c40f9af7.png?resizew=360)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dbe7369f07fda5becf396f1dcff395.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83940bc74f07a71ce38af3d3c0f79df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
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