如图,AB是⊙O的直径,
,连接DE、DB,延长AE交BD的延长线于点M,过点D作⊙O的切线交AB的延长线于点C.
(1)求证:DE=DM;
(2)若OA=CD=2
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de2a5f04739a1ce8d3f37a9e4379d65.png)
(1)求证:DE=DM;
(2)若OA=CD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/9/2890544275177472/2890662896648192/STEM/93f4bb70-563a-4d9e-a6a7-1d75f2499473.png?resizew=230)
更新时间:2022-01-09 11:31:37
|
相似题推荐
解答题-证明题
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【推荐1】(综合与实践
【问题情境】
为了研究四边形中与中点有关的“手拉手模型”问题,老师给数学社团的学生准备了一张印有四边形
的纸片,E,F分别是线段
和
的中点,如图1.
老师引导同学们用三角尺分别过点E,F作线段
和
的垂线,两垂线交于点G,连接
.
老师引导同学们探究:由于四边形的不稳定性,点的位置也在发生变化,在变化的过程中能有哪些发现呢?
经过思考和讨论,大刚和小莹给同学们分享了自己的发现.
时,
.”
(2)如图2,小莹发现:“当图形满足条件
时,
.”
老师肯定了两人结论的正确性,请你说明两人结论成立的理由.
【拓展应用】
(3)如图3,小明在大刚和小莹发现的基础上,经过进一步思考发现:“若
所在的直线互相垂直,且
,就能求出
的值.”老师也肯定了小明结论的正确性,请你帮小明求出
的值.
【问题情境】
为了研究四边形中与中点有关的“手拉手模型”问题,老师给数学社团的学生准备了一张印有四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
老师引导同学们用三角尺分别过点E,F作线段
![](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/aec12d33df7d5e1a540f88578a551909.png)
老师引导同学们探究:由于四边形的不稳定性,点的位置也在发生变化,在变化的过程中能有哪些发现呢?
经过思考和讨论,大刚和小莹给同学们分享了自己的发现.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a02d211a127c0924e950ec03e71bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
(2)如图2,小莹发现:“当图形满足条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a02d211a127c0924e950ec03e71bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034cc5d64b603ae5f42b2b240d858d9a.png)
老师肯定了两人结论的正确性,请你说明两人结论成立的理由.
【拓展应用】
(3)如图3,小明在大刚和小莹发现的基础上,经过进一步思考发现:“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6469878a955cc09fac22ba5aea3fb962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】在菱形
中,
,点P是射线
上一动点,以
为边向右侧作等边
,点E的位置随着点P的位置变化而变化.
(1)如图1,当点E在菱形
内部或边上时,连接
与
的数量关系是___________,
与
的位置关系是___________;
(2)如图2,当点E在菱形
外部时,(1)中的结论是否还成立?请说明理由;
(3)若
,当
旋转到C、P、E在一条线上时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/4fc33e73-ebc6-4f23-9f18-588609ac982a.png?resizew=345)
(1)如图1,当点E在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ecc1fb207aa1f0da0bdfec4983d8c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,当点E在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐1】如图
,锐角
内接于
,
的平分线
交
于点
,交
于点
,连接
,
,过点
作
的垂线交
于点
,点
在
上,连接
,
,若
且
.
;
(2)
求
的度数;
求证:
;
(3)如图
,延长
交
于点
,若
且
恰好等于
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/7cbce11aa19b8bd2bf6ee5a834e005de.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ba1514159423ad2a0f7adf72225ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74814e8b74018c4f3509345a882bb8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f37c453fd42f9b89d61ef9055fc1ce43.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4550bb8f51b698334a79a4c45980f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa931ebeb4ed1c54f1e93c67f239582e.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3e27f6e6d1592408508cc9fd14d480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd441ecd5fbb5f1d158d7c28558c433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
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【推荐2】如图,在⊙O中,AB、DE为⊙O的直径,C是⊙O上一点,且
=
.
(1)BE与CE有什么数量关系?为什么?
(2)若∠BOE=60°,则四边形OACE是什么特殊的四边形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8192018a58bb1fe23769a48a4d9042ed.png)
(1)BE与CE有什么数量关系?为什么?
(2)若∠BOE=60°,则四边形OACE是什么特殊的四边形?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/b2cc69da-bf73-4369-b38e-42e96ca5c70b.png?resizew=132)
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【推荐1】如图,△ABC中,AB=AC,以AB为直径作⊙O,分别交BC、AC于点D、E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/5ed6a410-7279-4797-8748-a05c605e7474.png?resizew=153)
(1)求证:BD=CD;
(2)若∠ABC=63°,求∠BDE的度数;
(3)过点D作⊙O的切线,交AB的延长线于点F,当AO=DF=4时,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/5ed6a410-7279-4797-8748-a05c605e7474.png?resizew=153)
(1)求证:BD=CD;
(2)若∠ABC=63°,求∠BDE的度数;
(3)过点D作⊙O的切线,交AB的延长线于点F,当AO=DF=4时,求图中阴影部分的面积.
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【推荐2】已知:如图,BC为⊙O的弦,点A为⊙O上一个动点,△OBC的周长为16.过C作CD∥AB交⊙O于D,BD与AC相交于点P,过点P作PQ∥AB交于Q,设∠A的度数为α.
(1)如图1,求∠COB的度数(用含α的式子表示);
(2)如图2,若∠ABC=90°时,AB=8,求阴影部分面积(用含α的式子表示);
(3)如图1,当PQ=2,求
的值.
(1)如图1,求∠COB的度数(用含α的式子表示);
(2)如图2,若∠ABC=90°时,AB=8,求阴影部分面积(用含α的式子表示);
(3)如图1,当PQ=2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc5649c632168e18daab3cf17c6d1d0.png)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2179983192203264/2181566789484544/STEM/b255a15d3d3e4e4ba7e75b4fbf34de6e.png?resizew=298)
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【推荐1】如图1,四边形
内接于
,
为直径,过点
作
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2023/2/22/3180413156917248/3188556512362496/STEM/e926ec3966e84e4db6aaf7feaf08afe9.png?resizew=357)
(1)求证:
;
(2)若
是
的切线,
,连接
,如图2.
①请判断四边形
的形状,并说明理由;
②当
时,求
,
与
围成阴影部分的面积.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2023/2/22/3180413156917248/3188556512362496/STEM/e926ec3966e84e4db6aaf7feaf08afe9.png?resizew=357)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a0e8a5b22995702a2618ae7c1262d7.png)
(2)若
![](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/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
①请判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.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/83bb3820bab977db734f4335e4fde720.png)
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名校
【推荐2】已知,在半圆
中,直径
,点
、
在半圆
上运动,(点
、
可以与A、
两点重合),弦
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b2a5f2ba-e887-485d-ad17-92a0efe0eaf2.png?resizew=629)
(1)如图1,当
时,求证:
;
(2)如图2,若
时,求图中阴影部分(弦
、直径
、弧
围成的图形)的面积;
(3)如图3,取
的中点
,点
从点A开始运动到点
与点
重合时结束,在整个运动过程中:
①求点
到
的最小值距离;
②直接写出点
的运动路径长______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/f52a58fbaf4fea03567e88a9f0f6e37e.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/17/b2a5f2ba-e887-485d-ad17-92a0efe0eaf2.png?resizew=629)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f7abf31402fcfd6f86fb434adc37d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99c9b81535f77e6c4ac21a33b9a75ba.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e08c088f4281baf6c431ca4ee1fa0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/7f9e8449aad35c5d840a3395ea86df6d.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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