如图,在
中,
,
,
.O为
边上一点,以O为圆心,
为半径作半圆,分别于与边
交于点D、E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/210ed17b-4686-4b71-836d-d6f5a5d02a8a.png?resizew=136)
(1)
______°;
(2)当
时,求
的长;
(3)过点E作半圆O的切线,当切线与边
相交时,设交点为F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdba2ac1a72eea482f5578843e00357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/210ed17b-4686-4b71-836d-d6f5a5d02a8a.png?resizew=136)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)过点E作半圆O的切线,当切线与边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e59617707e98c3441445392333b491.png)
2023·河北石家庄·一模 查看更多[3]
更新时间:2023-03-25 11:45:59
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,点
是
的内心,
的延长线交
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/df211cf8-6183-4e29-b1de-967f4a28aa6b.png?resizew=171)
(1)求证:
;
(2)连接
,若
,求
的值.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/df211cf8-6183-4e29-b1de-967f4a28aa6b.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503668fcc7878c81c664c13fa47cba29.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7b8ab7744c97d136d96bdcd9b402cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5509269c540ac83ba34d2e8a31242903.png)
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【推荐2】如图,点B、E分别在AC、DF上,AF分别交BD、CE于点M、N,∠A=∠F,∠C=∠D.
(1)求证:四边形BCED是平行四边形;
(2)已知DE=3,连接BN,若BN平分∠DBC,求CN的长.
(1)求证:四边形BCED是平行四边形;
(2)已知DE=3,连接BN,若BN平分∠DBC,求CN的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/c492ea43-37e0-41ec-9c31-fea1eaa9d890.png?resizew=200)
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【推荐3】综合与实践
问题情境:数学活动课上,老师出示了一个问题:
如图1,在四边形ABCD中,
,E是线段BD上一点,
,
,求证:
.
独立思考:(1)请解答老师提出的问题.
实践探究:(2)在原有问题条件不变的情况下,老师提出新问题:请同学们通过观察和度量,判断AE、BE和BC存在怎样的数量关系,并请你解答.
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,当
时,再给出等腰
中边一角,则图2中所有已经用字母标记的线段长均可求,该小组提出下面的问题,请你解答.
“如图2,若
,
,
,求ED的长.”
问题情境:数学活动课上,老师出示了一个问题:
如图1,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea25eb9180fa8e3a5e5b104b9ff684d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc5aec183f4453686346a63535c57916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ba85ca2c3cef2e094e57b60738272f.png)
独立思考:(1)请解答老师提出的问题.
实践探究:(2)在原有问题条件不变的情况下,老师提出新问题:请同学们通过观察和度量,判断AE、BE和BC存在怎样的数量关系,并请你解答.
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
“如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438fe61c5d141d76d887b6fc2e8aaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/c6fc707e-1197-42e0-9e54-718d3c316dee.png?resizew=292)
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名校
【推荐1】如图,等边
内接于
,
是
上任一点(点
与点A、
不重合),连接
、
,过点
作
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/2cc989fe-0b71-4e0f-bf4c-f42dccc720a9.png?resizew=163)
(1)求
和
的度数;
(2)求证:
是等边三角形;
(3)若
,
,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/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc20722b1d82d02ee876f1ac7efc970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/2cc989fe-0b71-4e0f-bf4c-f42dccc720a9.png?resizew=163)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1490f8bd695ad195aa1a52fe36373.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】如图1,在等腰
中,
,D是
上一点,以
为直角边作等腰
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/ca3d6faf-2b54-410a-ba4b-41af7ef968a2.png?resizew=417)
(1)求证:
;
(2)若
,
①求
的长;
②如图2,若F是
上一点,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.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/d110261e49b946b3e859ad0a8ba48a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/ca3d6faf-2b54-410a-ba4b-41af7ef968a2.png?resizew=417)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②如图2,若F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abf808637d3acbaabf6e5896c6631ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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【推荐1】如图:已知
是
的直径,
是弦,
切
于点
,交
的延长线于点
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712392475156480/2720933409718272/STEM/a4e28ac5-e1ae-4649-bf1e-1bb1edaee88e.png?resizew=202)
(1)求证:
;
(2)求
的半径.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/b6af38433c5ea5e25dce0ca0f3919c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c85409e4c685f7dbadae2de3cf9a09.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712392475156480/2720933409718272/STEM/a4e28ac5-e1ae-4649-bf1e-1bb1edaee88e.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,P为
的直径
的延长线上一点,
与
相切于C点,
,
的平分线
交
于点Q,
于D,交
于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/a6815403-d6d3-4c5e-9afd-7e1d1165147e.png?resizew=160)
(1)求证:
;
(2)若
,求
的值.
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2c9c32921b9f678056406dbb27fd9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8410859ee64ee7c8edc35beec6702d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/a6815403-d6d3-4c5e-9afd-7e1d1165147e.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b434bd3bc4cbf7f61a64ba53d5c0445.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc527c4af2dd1d10eb06c185495d62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120223970943dc87c216b0860e502254.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在正方形
中,点F为边
上的动点(点F与点B、D不重合),过点A、B、F作圆,交
于点E
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/dcea17b8-2611-49b9-b666-31ff0392c069.png?resizew=322)
(1)求证:
;
(2)延长
,交
于点G,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
①若
,
,求
的长;
②若
,求
的度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/dcea17b8-2611-49b9-b666-31ff0392c069.png?resizew=322)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8341ba2ce892b832068a216c30b197e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
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