(1)如图,
,
,
,
为以
为直径的圆上任意一点,求证:
为定值.
(2)尺规作图:以上图结论画出点
,使
,保留作图痕迹并写出步骤.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f6039eb12b502683fa787718600206.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/f36f2971-23f3-4317-8b3f-1061d8da6288.png?resizew=194)
(2)尺规作图:以上图结论画出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b2bd9ff91e731fd6b19b00ae7fb40f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/46b719bc-c075-485e-aac9-83a32d1300e3.png?resizew=143)
更新时间:2020-09-17 06:09:21
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相似题推荐
解答题-作图题
|
适中
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【推荐1】如图,已知OP平分
,点C在OP上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/ed67203a-d230-42d3-bec8-1c15c40c8a0d.png?resizew=198)
(1)求作四边形AOBC,使点A,B分别在射线OM,ON上,且
,
,垂足为C;(要求:尺规作图,不写作法,保留作图痕迹)
(2)在(1)的条件下,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/ed67203a-d230-42d3-bec8-1c15c40c8a0d.png?resizew=198)
(1)求作四边形AOBC,使点A,B分别在射线OM,ON上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4bed81b3e3b9de4e36262e7c57a8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6971395b99e63109542b0369d44e4994.png)
(2)在(1)的条件下,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a654ded6df925fbd3ba12cd194268a24.png)
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解答题-作图题
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适中
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【推荐2】(1)如图1,在⊙O中,AB是直径,弦EF∥AB,在直径AB下方的半圆上有一个定点H(点H不与点A,B重合),请仅用无刻度的直尺 画出劣弧
的中点P,并在直线AB上画出点G,使直线AB平分∠HGP.(保留作图痕迹,不写作法)
(2)尺规作图 :如图2,已知线段a、c,请你用两种不同的方法作Rt△ABC,使其斜边AB=c,一条直角边BC=a.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd0794862c0f6f14ff48daf0efd5ac2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/00099177-febb-49ea-9491-eb82828ac29f.png?resizew=321)
(2)
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解答题-证明题
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适中
(0.65)
【推荐1】(1)如图,正方形
中,点
,
分别在边
,
上,
于点
,求证:
;
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189274119094272/2190398497316864/STEM/7ad2ad2bc5a8425dab1692f619141e07.png?resizew=102)
(2)如图,矩形
中,
,
,点
,
分别在边
,
上,
于点
,探究
与
的数量关系,并证明你的结论;
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189274119094272/2190398497316864/STEM/e5fc13e24ef84a30981efd4e535b8b0c.png?resizew=116)
(3)在(2)的基础上,若
,
,其他条件不变,请直接写出
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.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/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9576dc0787e3a65d7f8ea2a436617c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a96c40a30c9ec1bce261219f171002.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189274119094272/2190398497316864/STEM/7ad2ad2bc5a8425dab1692f619141e07.png?resizew=102)
(2)如图,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.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/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9576dc0787e3a65d7f8ea2a436617c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189274119094272/2190398497316864/STEM/e5fc13e24ef84a30981efd4e535b8b0c.png?resizew=116)
(3)在(2)的基础上,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861782b8bb24df197194d9400c8e88a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d92a746d9b7304bcfc4e1e7869d145a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
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解答题-证明题
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名校
【推荐2】如图,已知四边形ABCD中,AB∥DC,AB=DC,且AB=4cm,BC=8cm,对角线AC=
cm.
(1)求证:四边形ABCD是矩形;
(2)如图2,点Q是AC上一点,点P是BC上一点,点P不与点B重合,
,连接BQ、AP,若AP⊥BQ,求BP的值;
(3)如图3,若动点Q从点C出发,以每秒
cm的速度在对角线AC上运动至点A止,过点Q作BC垂线于点P,连接PQ,将△PQC沿PQ折叠,使点C落在直线BC上的点E处,得△PQE,是否存在某一时刻t,使得△EAQ为直角三角形?请求出所有可能的结果.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588c3822b7812e711b4ad86647b15dc1.png)
(1)求证:四边形ABCD是矩形;
(2)如图2,点Q是AC上一点,点P是BC上一点,点P不与点B重合,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc971edcd3941bb436333bff076848c.png)
(3)如图3,若动点Q从点C出发,以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2020/10/13/2570048905461760/2570361835225088/STEM/504aa190c5bf48d7a0eecb19350e35d8.png?resizew=419)
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解答题-证明题
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解题方法
【推荐3】若△ABC绕点A逆时针旋转α后,与△ADE构成位似图形,则我们称△ABC与△ADE互为“旋转位似图形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/2bea4825-70aa-4ff1-af80-4cae25802348.png?resizew=507)
(1)知识理解:
如图1,△ABC与△ADE互为“旋转位似图形”.
①若α=25°,∠D=100°,∠C=28°,则∠BAE= ;
②若AD=6,DE=7,AB=4,则BC=
(2)知识运用:
如图2,在四边形ABCD中,∠ADC=90°,AE⊥BD于点E,∠DAC=∠DBC,求证:△ACD与△ABE互为“旋转位似图形”.
(3)拓展提高:
如图3,△ABG为等边三角形,点C为AG的中点,点F是AB边上的一点,点D为CF延长线上的一点,点E在线段CF上,且△ABD与△ACE互为“旋转位似图形”.若AB=6,AD=4,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/2bea4825-70aa-4ff1-af80-4cae25802348.png?resizew=507)
(1)知识理解:
如图1,△ABC与△ADE互为“旋转位似图形”.
①若α=25°,∠D=100°,∠C=28°,则∠BAE= ;
②若AD=6,DE=7,AB=4,则BC=
(2)知识运用:
如图2,在四边形ABCD中,∠ADC=90°,AE⊥BD于点E,∠DAC=∠DBC,求证:△ACD与△ABE互为“旋转位似图形”.
(3)拓展提高:
如图3,△ABG为等边三角形,点C为AG的中点,点F是AB边上的一点,点D为CF延长线上的一点,点E在线段CF上,且△ABD与△ACE互为“旋转位似图形”.若AB=6,AD=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c06b39a3804e08a580e8defa3e84cb.png)
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