如图,
,
是
的两条切线,切点分别为
,
,连接
并延长交
于点
,过点
作
的切线交
的延长线于点
,
于点
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893481486123008/2894057179881472/STEM/f2f9b02c-e2a4-488a-a434-5d2a33f11547.png?resizew=252)
(1)求证:四边形
是矩形;
(2)若
,
,求
的长..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.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/8455657dde27aabe6adb7b188e031c11.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893481486123008/2894057179881472/STEM/f2f9b02c-e2a4-488a-a434-5d2a33f11547.png?resizew=252)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a057bdfebe7eea1e954311fd696f2ee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
更新时间:2022-01-14 06:37:18
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,已知
中
,
,E是
的中点,连接
并延长,与
的延长线交于点F,与
交于点G,连接
.
是矩形.
(2)若
的面积是18,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9186e4574ffe28e673724fcb019db208.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐2】如图,
是等腰
底边
上的高,
﹐点是O的
中点,连接
并延长交
于点E,连接
.求证:四边形
是矩形.(完成下面证明过程)
证明:∵点O是
的中点,
∴
.
∵
,
∴
.
又∵
,
∴
(______)
∴______.
又∵
﹐
∴四边形
是平行四边形.
∵
是等腰
底边
上的高,
∴______.
∴四边形
是矩形.(______)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/fa3cd932-ce2a-4c1d-9f5e-e2a7b8d6cedb.png?resizew=162)
证明:∵点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76810f7354ca548a243754b1ae5e15d1.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de7c1101bdf2c5c223240d26b977999.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41dca47f8bd7c2cccfef9d0856ebb8f.png)
∴______.
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
∴______.
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
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【推荐3】(1)如图①,在平行四边形ABCD中,AC、BD交于点O,过点O作直线EF分别交AD、BC于点E、F,![](https://img.xkw.com/dksih/QBM/2016/9/7/1574231863238656/1574231869538304/STEM/50f3d6b8373f496e98b10db38a59c0c7.png)
求证:OE=OF.
(2)在图①中,过点O作直线GH分别交AB、CD于点G、H,且满足GH⊥EF,连结EG、GF、FH、HE.如图②,试判断四边形EGFH的形状,并说明理由;
(3)在(2)的条件下,
若平行四边形ABCD变为矩形时,四边形EGFH是 ;
若平行四边形ABCD变为菱形时,四边形EGFH是 ;
若平行四边形ABCD变为正方形时,四边形EGFH是 .
![](https://img.xkw.com/dksih/QBM/2016/9/7/1574231863238656/1574231869538304/STEM/50f3d6b8373f496e98b10db38a59c0c7.png)
求证:OE=OF.
(2)在图①中,过点O作直线GH分别交AB、CD于点G、H,且满足GH⊥EF,连结EG、GF、FH、HE.如图②,试判断四边形EGFH的形状,并说明理由;
(3)在(2)的条件下,
若平行四边形ABCD变为矩形时,四边形EGFH是 ;
若平行四边形ABCD变为菱形时,四边形EGFH是 ;
若平行四边形ABCD变为正方形时,四边形EGFH是 .
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【推荐1】如图所示,在平面直角坐标系
中,P是轴x正半轴上一点,半圆(⊙P的一部分)与x轴的正半轴交于A、B两点,A在B的左侧,且OA、OB的长是方程
的两根.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/820fff27-0575-4780-9523-c61de941e44e.png?resizew=170)
(1)求⊙P的半径;
(2)过点O作半圆的切线,并证明所作直线为⊙P切线;(要求尺规作图,保留作图痕迹)
(3)直接写出切点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24fdf96560fb2b54a6d40b2e57a8ff1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/820fff27-0575-4780-9523-c61de941e44e.png?resizew=170)
(1)求⊙P的半径;
(2)过点O作半圆的切线,并证明所作直线为⊙P切线;(要求尺规作图,保留作图痕迹)
(3)直接写出切点Q的坐标.
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【推荐2】如图,
是
的外接圆,直径
,直线
经过点
,
于点
,
.
(1)求证:
是
的切线;
(2)若
,求
的长;
(3)在(2)的条件下,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b731c2724383ea2a4432ef5ef06caf8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/2f767165-d4c7-40c5-ac96-aed999060dde.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(3)在(2)的条件下,求图中阴影部分的面积.
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】已知:如图
是
的直径,
,
与
分别相切于点
、点
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d74bc72d-5eb8-4453-a139-9179333d65e9.png?resizew=159)
(1)求证:
是
的切线;
(2)若
的直径为10,设
,
,求
关于
的函数解析式.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d74bc72d-5eb8-4453-a139-9179333d65e9.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b299f5cddf9da033ec3a996f42ae54b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图,以AB为直径作
,在
上取一点C,延长AB至点D,连接DC,
,过点A作
交DC的延长线于点E.
的切线;
(2)若
,
,求AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b213b0feac94a8242790df27d4192b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b1472e121da0ae5550329cfda5f0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3bd7fcc7124307e9c33f98c53f2edf.png)
您最近一年使用:0次