如图所示,
、
为
的切线,
、
是
、
的中点,连接
交
点
,连接
交
于
,连接
交
于
,求证:
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/48f3c9abbd78e9a6840ee5f30381daac.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/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db492efc6bfe199d47633e6d5946ad57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/97db3a6d-fa28-46bd-bf7b-5a65f1e54ff5.png?resizew=191)
更新时间:2018-03-05 14:50:14
|
相似题推荐
解答题-证明题
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【推荐1】如图,已知平行四边形ABCD,点E在AC的延长线上,连接BE、DE,过点D作DF
EB交CA的延长线于点F,连接FB
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005619794272256/3006072432181248/STEM/1e6316706105434e9dd72e85356f3651.png?resizew=186)
(1)求证:
DAF≌
BCE;
(2)如果四边形ABCD是菱形,求证:四边形BEDF是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005619794272256/3006072432181248/STEM/1e6316706105434e9dd72e85356f3651.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)如果四边形ABCD是菱形,求证:四边形BEDF是菱形.
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【推荐2】如图,平行四边形
中,
分别是
的平分线,且点
,
分别在边
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/2d7b9cf0-39b5-48e5-a231-ca11fb4f38f3.jpg?resizew=175)
(1)求证:四边形
是菱形;
(2)若
的面积等于
,求平行线
与
间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b1efb5d9072a67be9d5497a783016c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e2cd0c463743951bdf34b83de2343b.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/c46c696ff5f123a482bae81cf9a1b570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/2d7b9cf0-39b5-48e5-a231-ca11fb4f38f3.jpg?resizew=175)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce353a208cad4a59ee301eb0a6c912be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6093eebca8f3ff82ce9298feb197e955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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【推荐1】如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC边于点D,交AC边于点E.过点D作⊙O的切线,交AC于点F,交AB的延长线于点G,连接DE.
(1)求证:BD=CD;
(2)若∠G=40°,求∠AED的度数.
(3)若BG=6,CF=2,求⊙O的半径.
(1)求证:BD=CD;
(2)若∠G=40°,求∠AED的度数.
(3)若BG=6,CF=2,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/f8a868a0-1f62-40df-b379-c03b4342e89e.png?resizew=150)
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【推荐2】如图,已知
是
的直径,弦
于点
是
上的一点,
的延长线相交于点
.
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620267993382912/2620496945750016/STEM/c7d173cf-5ec5-41ba-a9ff-e27b9404bff6.png)
(1)若
的半径为
,且
,求弦
的长.
(2)求证:
.
![](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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d98619140b8efb54e92ef3bf6b3b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2020/12/23/2620267993382912/2620496945750016/STEM/c7d173cf-5ec5-41ba-a9ff-e27b9404bff6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4093d095f61fa00d2f64f39d6aa577cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc20f64fcd4465bdf78387763d45765.png)
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【推荐1】矩形
中,
,
是边
上一点,以
为边在矩形在
内部构造矩形
.
(1)特例发现
如图
,当
时,
;
(2)类比探究
如图
,如图,将矩形
绕点
顺时针旋转
度
,连接
,当
时,求
的值;
(3)拓展运用
如图
,矩形
在旋转的过程中,
落在
边上时,若
、
、
三点共线,
时,当
时,则
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ffbc31b0bc8d39887ecae16d792d2a.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/936c5658-7a78-4cd6-9db4-55a73341d1eb.png?resizew=343)
(1)特例发现
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cc97999243c11718a026b55e3ba8c2.png)
(2)类比探究
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642f62e30faae3c8f63c77c3a1b89891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7933b5fb0fbfc962adcd7b2cb5d99f.png)
(3)拓展运用
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2f91aa5dea19712561c7905535d15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761547ebdcfc99f8ba75b841afb9c09c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
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【推荐2】以下各图均是由边长为1的小正方形组成的网格,
均在格点上.
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648923742167040/2650311549108224/STEM/95d4601c-6cd5-4420-8f75-2d1c8c63a579.png)
(1)在图①中,
的值为______;
(2)利用网格和无刻度的直尺作图,保留痕迹,不写作法.
①如图②,在
上找一点
,使
;
②如图③,在
上找一点
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d7dd733fe8e8d7bdbe1b8190cfdf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955f8ccd3819df2b05ff5fb32e84b5df.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4496fe22b40bc63581998e6b7ef6783.png)
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648923742167040/2650311549108224/STEM/95d4601c-6cd5-4420-8f75-2d1c8c63a579.png)
(1)在图①中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065947aa06152f215574637586063c6a.png)
(2)利用网格和无刻度的直尺作图,保留痕迹,不写作法.
①如图②,在
![](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/e713f0ba80e87438cf6273fb00cb81a7.png)
②如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6d7dd733fe8e8d7bdbe1b8190cfdf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955f8ccd3819df2b05ff5fb32e84b5df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebb58c0b64dc55123a6a04f793aced0.png)
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【推荐3】综合与实践
【问题情境】
学习完旋转这章内容后,在一次数学活动课上,刘老师让学生用一张矩形纸片(矩形
)与一张直角三角形纸片(
)进行数学活动,如图1,
,
,
,点M是
和
的中点,将
绕点M顺时针旋转
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/c2dc787d-20fb-42be-b683-a24b34b9b629.png?resizew=155)
【探究发现】
(1)如图2,自强小组发现,在旋转过程中,当
时,四边形
是一个特殊的四边形.请你判断四边形
的形状,并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/03ab91c4-770e-4954-850f-ef40a9509e13.png?resizew=154)
(2)奋进小组在自强小组的基础上连接
,通过探究发现,在旋转过程中,
的值始终为定值,请你求出这个定值;
【问题解决】
(3)创新小组提出一个问题,将
绕点M继续旋转,当
时,边
与
交于H,如图3,试直接写出线段
的长.
【问题情境】
学习完旋转这章内容后,在一次数学活动课上,刘老师让学生用一张矩形纸片(矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780372ac3d30d72fc9459827c89ba078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d108c69b0eebed90ab9a68df20b7790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f4fe60b81ff21ca2acc95848a643d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/c2dc787d-20fb-42be-b683-a24b34b9b629.png?resizew=155)
【探究发现】
(1)如图2,自强小组发现,在旋转过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/03ab91c4-770e-4954-850f-ef40a9509e13.png?resizew=154)
(2)奋进小组在自强小组的基础上连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fadd86888c9722b51062bf417a8fd5e.png)
【问题解决】
(3)创新小组提出一个问题,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/0ebe4ced-ab92-4564-9d2c-991652cf3979.png?resizew=164)
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【推荐1】如图,已知圆内接四边形ABCD,AB∥DC.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904243059400704/2936785976836096/STEM/df5ab4ab-27ff-43cf-9917-dda604cd9efd.png?resizew=135)
(1)求证:AD=BC;
(2)当圆内接四边形ABCD的对角线AC与BD交于圆心O时,判断四边形ABCD的形状,并写出判断过程.
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904243059400704/2936785976836096/STEM/df5ab4ab-27ff-43cf-9917-dda604cd9efd.png?resizew=135)
(1)求证:AD=BC;
(2)当圆内接四边形ABCD的对角线AC与BD交于圆心O时,判断四边形ABCD的形状,并写出判断过程.
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【推荐2】如图,AB,CD是⊙O的两条直径,过点A作AE∥CD交⊙O于点E,连接BD,DE,求证:BD=DE.
![](https://img.xkw.com/dksih/QBM/2017/8/17/1753855423791104/1754118000279552/STEM/37865dcee0884eb8a83e9f1b84f7ca59.png?resizew=121)
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