如图,
是
的直径,四边形
内接于
,连接
,
,过点D作
交
的延长线于点E.
是
的切线;
(2)若
,
的半径为
,求
的长.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea0d1d36ccbf5c6e4513dae86c4228a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edbbab119e1b312eb4b09d383a4410a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2024-05-12 12:10:36
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,
是
的切线,
交
于另一点D,且
.
![](https://img.xkw.com/dksih/QBM/2023/4/21/3221359092555776/3256051546226688/STEM/5ab3eacdc4f342679db774e8b74b6158.png?resizew=175)
(1)求证:
;
(2)若E为弧
的中点,
,连接
,求
的长及阴影部分的面积.
![](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/9b1ec05e3cec27677ded7b4aecaa62d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03792cfb2b3540e9f8992d6daa36700d.png)
![](https://img.xkw.com/dksih/QBM/2023/4/21/3221359092555776/3256051546226688/STEM/5ab3eacdc4f342679db774e8b74b6158.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bcc1b9b8eec9d79f0d507b968d9ade.png)
(2)若E为弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c44512cb86bcf48c6d21357f45b533.png)
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【推荐2】如图,四边形
是平行四边形,以AB为直径的⊙O经过点D,点E是⊙O上一点,且∠AED=45°.
(1)试判断CD与⊙O的位置关系,并说明理由;
(2)若⊙O的半径为
,
,求∠ADE的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)试判断CD与⊙O的位置关系,并说明理由;
(2)若⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f319d8ffd15a6ce36ca7aecad4fd087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba3ae8b7b9f2698cca3c374d39650d5.png)
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解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,已知:AO为
的直径,
与
的一个交点为E,直线AO交
于B、C两点,过
的切线GF,交直线AO于点D,与AE的延长线垂直相交于点F.
![](https://img.xkw.com/dksih/QBM/2012/9/12/1573513410060288/1573513468125184/STEM/971cacf55ee54074a92639566a1599f9.png)
(1)求证:AE是
的切线;
(2)若AB=2,AE=6,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://img.xkw.com/dksih/QBM/2012/9/12/1573513410060288/1573513468125184/STEM/971cacf55ee54074a92639566a1599f9.png)
(1)求证:AE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
(2)若AB=2,AE=6,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dfa7f65dfc99afe865497978b83799d.png)
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解答题-计算题
|
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【推荐2】小明在学习了《圆周角定理及其推论》后,有这样的学习体会:在
中,
,当
长度不变时.则点C在以
为直径的圆上运动(不与A、B重合).
【探索发现】
(1)小明继续探究,在
中,
,
长度不变.作
与
的角平分线交于点F,小明计算后发现
的度数为定值,小明猜想点F也在一个圆上运动.请你计算
的度数,并简要说明 小明猜想的圆的特征.
【拓展应用】
(2)在【探索发现】的条件下,若
,求出
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/c3217614-1ddd-4ffc-85c5-7e187cbba86f.jpg?resizew=203)
【探索发现】
(1)小明继续探究,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
【拓展应用】
(2)在【探索发现】的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4139b091e9dc432b267ff68420c77de4.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
,以
为直径作
交
于点
,交
于点
,
平分
且
,连接
.
是
的切线;
(2)若
,
,求图中阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e99c17d72c203b50802f19d4731545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01009f2f3a3476fd1efe90291083132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/214d99ce9f50286dcff41db85083c979.png)
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(0.65)
【推荐2】如图,在
中,弦
与弦
相交于点G,
于点E,过点B的直线与
的延长线交于点F,
.
,求证:
是
的切线;
(2)求证:
;
(3)若
,
,求
的半径;
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21be01a95cdd3149512bf95d6084fdd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4adaef7e7b430e58c519aed74904cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37a774c60070e9b29b23e894b23d01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bd5dbcd9d2b793ff893dbe1f06987f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21e236ccd924adbae23d742e1db3b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fad110cc650ed13eb266f77b69610bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在
中,D为
边的中点,E为
边上的任意一点,
交
于点O.
(1)当
时,
______;
(2)当
时,
______;
(3)当
时,
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/01d6eae3-b4a8-467a-a1c0-07b5672a9dd3.png?resizew=163)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b217436e66e9b40ca9bb001f141fdb84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b465e0ea8f4b119859698c8f1623706.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a72599cfdfa9cd0a491b831100a2ede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b465e0ea8f4b119859698c8f1623706.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd34d84db73df3997a231cebb802938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b465e0ea8f4b119859698c8f1623706.png)
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名校
【推荐2】三角尺是几何学习中常用的学具.
【重温旧知】
(1)图①~③是课本上三角尺的3种摆放方式.借助图①中的
和
,课本定义了一种两个角的关系,这种关系叫做______;图②中,
的度数是______°,三角尺
的直角边
和三角尺
的直角边
之间的数量关系是______;图③中确认弦
是圆的直径的定理是______.
(2)如图④,将图②中的一副三角尺
和
叠放在一起,使得点
,
分别在
,
边上,我们在同一平面内研究下面两个问题.
①当
时,求
的值;
②若
的长为
,直接写出顶点
和
的距离的最大值(用含
的代数式表示).
【重温旧知】
(1)图①~③是课本上三角尺的3种摆放方式.借助图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15417741fba20d681ab4414b07339099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)如图④,将图②中的一副三角尺
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cad97dd9d9593fa01342550aba6ec47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed741e2a35f7af743cbc5901dc57c734.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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