如图.
过长方形
的顶点
和
上一点
.且与
相切于点
,
分别交
于
两点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c80f1c211f11d7e03ab8b7eaa379efc.png)
求证:
是
的切线;
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007265792/STEM/586ddee5-9938-4865-adcd-9b23dc9749ad.png?resizew=206)
连接
.若
求
的值.
![](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/8455657dde27aabe6adb7b188e031c11.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7835c72d14f9d61b95b15aa47fafac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c80f1c211f11d7e03ab8b7eaa379efc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007265792/STEM/586ddee5-9938-4865-adcd-9b23dc9749ad.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a96fb52523fcc9b1dcef62041c6dca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313b598ddd1971f5728fdc16707358f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd67e7ab00fa0ef4c7e75f6406f55b5c.png)
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562838002860032/2564301007265792/STEM/ed75f45c-9912-41aa-ae1a-24d38e9e4588.png?resizew=201)
更新时间:2020-10-05 09:06:39
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,正方形
中,点E在边
上(不与端点A,D重合),点A关于直线
的对称点为点F,连接
,设
.
的大小;
(2)过点C作
,垂足为G,连接
.
①求证:
;
②连接
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3160d33de228937b8a691519fced22e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858bab4f7ca681a83a0f3e95feb740a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab7fdb2945ae0ca30e9732a5c97f8bb.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8546ce1dcb38635a5964536bfc73f0db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
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解答题-问答题
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名校
解题方法
【推荐2】如图坐标系中,矩形ABCD的边BC在 y轴上,B(0,8),BC=10,CD=5,将矩形ABCD绕点B逆时针旋转使点C落在x轴上.现已知抛物线y=ax2+bx+c(a≠0)过点D、C′和原点O.
(1)求抛物线的解析式;
(2)将矩形A′BC′D′沿直线BC′翻折,点A′的对应点为M,请判断点M是否在所给抛物线上,并简述理由;
(3)在抛物线上是否存在一点P,使∠POC′=2∠CBD,若存在,求出点P的坐标,若不存在,请说明理由;
(1)求抛物线的解析式;
(2)将矩形A′BC′D′沿直线BC′翻折,点A′的对应点为M,请判断点M是否在所给抛物线上,并简述理由;
(3)在抛物线上是否存在一点P,使∠POC′=2∠CBD,若存在,求出点P的坐标,若不存在,请说明理由;
![](https://img.xkw.com/dksih/QBM/2021/5/27/2729951664635904/2768347974361088/STEM/58d316c1-611b-44cb-806f-79d8a855effd.png)
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解答题-问答题
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较难
(0.4)
【推荐1】在矩形
中,
,点P从点A出发,沿
边向点B以每秒
的速度移动,同时点Q从点D出发沿
边向点A以每秒
的速度移动,P、Q其中一点到达终点时,另一点随之停止运动.设运动时间为t秒.解答下列问题:
的面积等于
;
(2)如图②,若以点P为圆心,
为半径作
.在运动过程中,是否存在t值,使得
经过点C?若存在,求出t的值;若不存在,请说明理由;
(3)如图③,若以Q为圆心,
为半径作
,当
与
相切时.
①求t的值.
②如图④,若点E是此时
上一动点,F是
的中点,连接
,则线段
的最大值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c604a42936cd344b0ceb3b87a6501946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce019005b5243d67ed1a996d4e752a31.png)
(2)如图②,若以点P为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
(3)如图③,若以Q为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①求t的值.
②如图④,若点E是此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】已知,⊙O过矩形ABCD的顶点D,且与AB相切于点E,⊙O分别交BC,CD于H,F,G三点.
(1)如图1,求证:BE-AE=CG;
(2)如图2,连接DF,DE.若AE=3,AD=9,tan∠EDF=
,求FC的值.
(1)如图1,求证:BE-AE=CG;
(2)如图2,连接DF,DE.若AE=3,AD=9,tan∠EDF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2021/6/17/2744840965341184/2745109446164480/STEM/c51f467b2ff84a06bc7d9abe2989ee99.png?resizew=306)
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较难
(0.4)
【推荐3】如图,在矩形ABCD中,AB=6,BC=8,O是AD的中点,以O为圆心在AD的下方作半径为3的半圆O,交AD于E、F.
思考:连接BD,交半圆O于G、H,求GH的长;
探究:将线段AF连带半圆O绕点A顺时针旋转,得到半圆O′,设其直径为E'F′,旋转角为α(0<α<180°).
(1)设F′到AD的距离为m,当m>
时,求α的取值范围;
(2)若半圆O′与线段AB、BC相切时,设切点为R,求
的长.
(sin49°=
,cos41°=
,tan37°=
,结果保留π)
思考:连接BD,交半圆O于G、H,求GH的长;
探究:将线段AF连带半圆O绕点A顺时针旋转,得到半圆O′,设其直径为E'F′,旋转角为α(0<α<180°).
(1)设F′到AD的距离为m,当m>
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6433d041d8f7bf65443a5bd8e36bdf3c.png)
(2)若半圆O′与线段AB、BC相切时,设切点为R,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf2fc178243446de75ecd97ccda2cf5.png)
(sin49°=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d78f02558d84c57e7db6d9c0221ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d78f02558d84c57e7db6d9c0221ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d78f02558d84c57e7db6d9c0221ba.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222452605927424/2223968087834624/STEM/882dc1159c7f4c24ab115fac519f0e63.png?resizew=312)
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