如图1、图2,平面上,四边形
中,
,
,
,
,
,点
在
上,且
.将线段
绕点
顺时针旋转
(
)到
,
的平分线
所在直线交折线
于点
,设点
在该折线上运动的路径长为
,连接
.
(1)如图2.连接
.
①求
的度数,并直接写出当
时,
的值为______;
②若点
到
的距离为2,求
的长;
(2)当
时,求出点
到直线
的距离是多少(用含
的式子表示).
![](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/5156c0f70ad1f6afbdd39360a595755b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7d2a2da5144f0bf6ce091c56b3d5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b466f14067ec8653e2cbbb2684245b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ef478c804c71ad3b374196a8ca9d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3d921fa160bfa9f74fe51dedfe3413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f716bf4707d5b38ac98240457c8e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c874dcef40efe6b2a806e58a5f122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778cdfe7346279f9695a745fb780e806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eade5411c1f595762b6e25258036586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b36c130a297aa266e8d3e28c568f48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/51be6edc-3335-400c-b982-998d06c7ebb1.png?resizew=515)
(1)如图2.连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4c64f54a581fdcd044c0ef93879442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204ab36d93b0d97ca1c9f1abb80a6373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2024-01-02 21:31:15
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】探究式学习是新课程倡导的重要学习方式,某兴趣小组拟做以下探究:
在
中,
是
边上一点,且
(
为正整数),
是
边上的动点,过点
作
的垂线交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/0e990538-8fca-4292-a3cb-50cade8b2eb7.jpg?resizew=292)
(1)如图1,当
时,兴趣小组探究得出结论:
,请写出证明过程;
(2)如图2,当
,且点
在线段
上时,试探究线段
之间的数量关系,请写出结论并证明;
(3)请通过类比、归纳、猜想,探究出线段
之间数量关系的一般结论是___________(直接写出结论,不必证明)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebed2c063afddb3e07f478e21daaf9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825671c551cc4593793b40c43d46757a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/0e990538-8fca-4292-a3cb-50cade8b2eb7.jpg?resizew=292)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36978e392c8df4668ed3f74641febbfe.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94494b32c28e665edd843820c68fb79.png)
(3)请通过类比、归纳、猜想,探究出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94494b32c28e665edd843820c68fb79.png)
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【推荐2】在Rt△ABC中,
,D,E,F分别是边AB,AC,BC上的点,
,
.
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987113735004160/2989005124173824/STEM/b978b338-4c70-4e4a-bb11-ea907a4c004c.png?resizew=536)
(1)如图1,若
,
,直接写出
的值;
(2)如图2,若
,
,(1)中的结论是否仍然成立?请证明你的结论;
(3)如图3,若
.
①求tan∠DFE的值;
②直接写出
的值.(用含n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f77256d3db06fe922ef699df09a3b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602ef38dc96e6e186a0a22cfd511bf5d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987113735004160/2989005124173824/STEM/b978b338-4c70-4e4a-bb11-ea907a4c004c.png?resizew=536)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2817671406f99b937023ed3d54f173.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df92b77039c6c22396a5e85877bc038a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
①求tan∠DFE的值;
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb33ce523fa361a6cc63204af835317.png)
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【推荐1】如图,
为
的直径,
,点E为
上一点,点F为
延长线上一点,
.连接
,交
于点G.
(1)证明:
为
的切线;
(2)证明:
;
(3)若
的半径为2,G为
的中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4046b4d36cb4a8dcccfe8237ab6ff530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/932bc424-6298-43ef-93a6-1b1db069c5b7.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3722ce5a109be331b49a0c49484865.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
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【推荐2】如图,在
中,
是
上一点,点
在
边上,连接
,过点
作
交
于点
.
(1)如图1,当
为
的中点时,求证:
.
(2)如图2,在(1)的条件下,过点
作
交
于点
,点
在
边上,连接
交
于点
,交
于点
,且
.
①猜想
和
的数量关系,并说明理由.
②求证:
.
(3)如图3,若
为点
关于
的对称点(点
不重合),连接
,
,当
为直角三角形时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3831becfd7a7067600346327ae803889.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/1aaa1e03-79a0-45ba-a30e-abd52771b484.png?resizew=602)
(1)如图1,当
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)如图2,在(1)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0aaf6dac21a8639b566634b768005f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d036e11fc225c4fb6057706b6d076d4.png)
①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9d2abf13c2842f58654abf73c6b4ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fd3beb303ae39bd20617239c539409.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e3f5be027da82a0ab3beacc79d7c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4cf40b6cf2051622c0a52e84710c138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd28db93364ac2a6f0e75ed245dbbfd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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名校
【推荐1】如图,四边形
是平行四边形,
于
,
于
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/4/b8ed5dcb-6e01-48a2-8e8d-0b6b2099914e.png?resizew=178)
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/4/b8ed5dcb-6e01-48a2-8e8d-0b6b2099914e.png?resizew=178)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e381afef0be6122e3c699eeb3c5ebaf8.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29280e561646bd82e07303d621855297.png)
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【推荐2】如图1,在平面直角坐标系
中,抛物线
过点点
,
,顶点为C,点P是抛物线上B,C之间的一个动点.
(2)是否存在点P,使得
的面积是
面积的
若存在,求出点P的横坐标;若不存在,则说明理由;
(3)如图2,抛物线的对称轴交x轴于点M,连接AP交对称轴于点N,连接BP并延长交对称轴于点Q.当点P运动时,
是否为定值?若是,求出该定值;若不是,请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5bca93f672c0492da6d136e0c54b3e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b6ff686e6aab6f538e26dc6a110e1a.png)
(2)是否存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3a33e16e6848e548e35820279bef85.png)
(3)如图2,抛物线的对称轴交x轴于点M,连接AP交对称轴于点N,连接BP并延长交对称轴于点Q.当点P运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50303d306511d1d210af31fab2a844a5.png)
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解题方法
【推荐3】已知:如图,在平面直角坐标系中,△ABC是直角三角形,∠ACB=90°,点A,C的坐标分别为A(﹣3,0),C(1,0),tan∠BAC=
.
(1)写出点B的坐标;
(2)在x轴上找一点D,连接BD,使得△ADB与△ABC相似(不包括全等),并求点D的坐标;
(3)在(2)的条件下,如果点P从点A出发,以2cm/秒的速度沿AB向点B运动,同时点Q从点D出发,以1cm/秒的速度沿DA向点A运动.当一个点停止运动时,另一个点也随之停止运动.设运动时间为t.问是否存在这样的t使得△APQ与△ADB相似?如存在,请求出t的值;如不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)写出点B的坐标;
(2)在x轴上找一点D,连接BD,使得△ADB与△ABC相似(不包括全等),并求点D的坐标;
(3)在(2)的条件下,如果点P从点A出发,以2cm/秒的速度沿AB向点B运动,同时点Q从点D出发,以1cm/秒的速度沿DA向点A运动.当一个点停止运动时,另一个点也随之停止运动.设运动时间为t.问是否存在这样的t使得△APQ与△ADB相似?如存在,请求出t的值;如不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/c3ab2a18-c6ec-463a-9a08-34b756337c23.png?resizew=258)
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解答题-作图题
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较难
(0.4)
【推荐1】在一次数学探究活动中,李老师设计了一份活动单:
学习小组通过操作、观察、讨论后得到:点A的位置不唯一,它在以
为弦的圆弧上(点B、C除外)……小华同学画出了符合要求的一条圆弧(如图1).
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/267f0b4bdc614da6b00d2df012f1bbbc.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/71d89a1332fc42c48cc62c40f764fa24.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/71d89a1332fc42c48cc62c40f764fa24.png?resizew=175)
(1)小华同学提出了下列问题,请你帮助解决.
①该弧所在圆的半径长为 :②
面积的最大值为 ;
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为
,请你利用图1证明
;
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,已知矩形
的边长为
,
,点P在直线
的左侧,且
.
①线段
长的最小值为 ;
②若
,求线段
的长.
已知线段![]() ![]() (1)这样的点A唯一吗? (2)点A的位置有什么特征?你有什么感悟? |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/267f0b4bdc614da6b00d2df012f1bbbc.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/71d89a1332fc42c48cc62c40f764fa24.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/2022/10/18/3090504502640640/3099752344616960/STEM/71d89a1332fc42c48cc62c40f764fa24.png?resizew=175)
图1 图2 备用图
(1)小华同学提出了下列问题,请你帮助解决.
①该弧所在圆的半径长为 :②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0ff2f59c2273aa45f3ff04884677d9.png)
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63247af194edc9d72cd3ca7365a5d128.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b359f096d4698f7acd6aecd5dea70229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-证明题
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较难
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【推荐2】如图,AB是圆O的直径,O为圆心,AD、BD是半圆的弦,且∠PDA=∠PBD.延长PD交圆的切线BE于点E.
(1)证明:直线PD是⊙O的切线;
(2)如果∠BED=60°,PD=
,求PA的长;
(3)将线段PD以直线AD为对称轴作对称线段DF,点F正好在圆O上,如图2,求证:四边形DFBE为菱形.
(1)证明:直线PD是⊙O的切线;
(2)如果∠BED=60°,PD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)将线段PD以直线AD为对称轴作对称线段DF,点F正好在圆O上,如图2,求证:四边形DFBE为菱形.
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