如图,△ABC中,AB=AC,以AB为直径的⊙O交BC于点D,交AC于点E,过点D作FG⊥AC于点F,交AB的延长线于点G.
(1)求证:FG是⊙O的切线;
(2)若tanC=2,求
的值.
(1)求证:FG是⊙O的切线;
(2)若tanC=2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ac5824cb19c278704ea57442ff4b6a.png)
更新时间:2018-07-26 16:09:53
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解答题-证明题
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【推荐1】在平面直角坐标系
中,矩形ABCO的面积为15,边OA比OC大2,E为BC的中点,以OE为直径的⊙O′交x轴于D点,过点D作DF⊥AE于F.
![](https://img.xkw.com/dksih/QBM/2011/5/13/1573210548568064/1573210611261440/STEM/ff5ab774-4fbf-4028-b0d6-505b8079a0ef.png)
(1) 求OA,OC的长;
(2) 求证:DF为⊙O′的切线;
(3)由已知可得,△AOE是等腰三角形.那么在直线BC上是否存在除点E以外的点P,使△AOP也是等腰三角形.如果存在,请你证明点P与⊙O′的位置关系,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://img.xkw.com/dksih/QBM/2011/5/13/1573210548568064/1573210611261440/STEM/ff5ab774-4fbf-4028-b0d6-505b8079a0ef.png)
(1) 求OA,OC的长;
(2) 求证:DF为⊙O′的切线;
(3)由已知可得,△AOE是等腰三角形.那么在直线BC上是否存在除点E以外的点P,使△AOP也是等腰三角形.如果存在,请你证明点P与⊙O′的位置关系,如果不存在,请说明理由.
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【推荐2】如图,四边形ABCD是⊙O的内接四边形,其中∠ADC=90°,在CD的延长线上有一点E,连接AE,且∠DAE=∠ABD.
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970509632536576/2971703908212736/STEM/d6ad844d-74f7-42f9-91bd-171af15378c2.png?resizew=193)
(1)求证:AE与⊙O相切;
(2)若AD=2,CD=4DE,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970509632536576/2971703908212736/STEM/d6ad844d-74f7-42f9-91bd-171af15378c2.png?resizew=193)
(1)求证:AE与⊙O相切;
(2)若AD=2,CD=4DE,求⊙O的半径.
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解答题-证明题
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解题方法
【推荐1】已知在菱形
中,
,
,点
是直线
上任意一点,连接
.在
内部作射线
与对角线
交于点
(与
、
不重合),且
,连接
.
(1)如图1,当点
在边
上时,如果
,求线段
的长;
(2)求证: △
是等腰三角形
(3)直线
与直线
交于点
,如果
与
相似,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/76d221944148d71e2e1bc76040aefb8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40ec8f8475d6e479ca5ae05202f43cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2b5060e1311f27bcbde24dac84db8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求证: △
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4613db540c9cb6a9d7e963bf89c2a8.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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/abdc3bf8f58be61959205faac69fe6a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58acf6133acb1381086a3036ff68582e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884292843847680/2885119868772352/STEM/e86b0adcbbfd4cd9a22992e0f678d50d.png?resizew=340)
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解答题-问答题
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【推荐2】如图抛物线y=ax2+bx+c与x轴交于点A、B,与y轴交于点C(0,-3),顶点D坐标为(-1,-4).
![](https://img.xkw.com/dksih/QBM/2015/10/9/1573919690522624/1573919697018880/STEM/d3bfac1339064de7a99b9e3974d159a7.png)
(1)求抛物线的解析式;
(2)如题图(1),求点A、B的坐标,并直接写出不等式ax2+bx+c>0的解集;
(3)如题图(2),连接BD、AD,点P为线段AB上一动点,过点P作直线PQ∥BD交线段AD于点Q,求△PQD面积的最大值.
![](https://img.xkw.com/dksih/QBM/2015/10/9/1573919690522624/1573919697018880/STEM/d3bfac1339064de7a99b9e3974d159a7.png)
(1)求抛物线的解析式;
(2)如题图(1),求点A、B的坐标,并直接写出不等式ax2+bx+c>0的解集;
(3)如题图(2),连接BD、AD,点P为线段AB上一动点,过点P作直线PQ∥BD交线段AD于点Q,求△PQD面积的最大值.
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解答题-应用题
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【推荐1】嘉淇看到这样一道题目:
如图,某巡逻船在
处测得一艘敌舰在北偏东
的
处,卫星测得
相距
海里,巡逻船静止不动,
分钟后测得该敌舰在巡逻船的北偏东
的
处,此时卫星信号突然中断,已知该敌舰的航速为
海里/小时.(结果保留整数,参考数据:
,
,
,
)
嘉淇过点
作
于
,设
海里,请你帮她接着解决以下问题:
______里(用含用
的代数式表示);
(2)求敌舰在
处时与巡逻船的距离.
如图,某巡逻船在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7451b9d94e28503b8ac931632ff9dbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e188db40ba54f682c33af8f9235df54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5e416f42d292f06f1962009d5568152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a208d78642b10c967148c050128f3bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2252ae7e8975c67a24ca325effe4abc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368763128d1ad0ffad5d859fef834d0a.png)
嘉淇过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4a7d7c2253a1686c61f8b8f3f6c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求敌舰在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】如图,在矩形纸片
中,已知
,
,点E在边
上移动,连接
,将多边形
沿直线
折叠 ,得到多边形
,点B、C的对应点分别为点
、
.
恰好经过点D时(如图1),求线段
的长;
(2)若
分别交边
,
于点F,G,且
(如图2);求
的面积.
(3)在点E从点C移动到点D的过程中,求点
运动的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17251261250abb8ef58a6ff25c8494b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6fd230a035f5b91abd7390b77138f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7126ce57dbb7317191269a72f623de8c.png)
(3)在点E从点C移动到点D的过程中,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
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