如图,菱形
中,
.点G是边
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/ae823421-c56f-44d0-b356-0be1eb33e9c7.png?resizew=186)
(1)画出线段
的垂直平分线,分别交
于E,交
于F(尺规作图,保留作图痕迹)
(2)求线段
的值;
(3)求
面积的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1307a8151973cb887350ababc5940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/ae823421-c56f-44d0-b356-0be1eb33e9c7.png?resizew=186)
(1)画出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
更新时间:2023-04-27 10:56:57
|
相似题推荐
解答题-作图题
|
较难
(0.4)
【推荐1】如图,在矩形
中,
.点
分别在
上,四边形
为菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/0d88d93d-acef-4b61-b090-882ed6459b03.png?resizew=369)
(1)利用尺规作图在图
中作出菱形
(不写作法,保留作图痕迹).
(2)如图
,动点
从点
出发沿射线
方向运动,同时,动点
从点
出发沿射线
方向运动,且
两点运动速度相同,
相交于点
.
①求
的度数.
②连接
,线段
长度的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a1b5ced89524bb9f860d19801cb5da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/24/0d88d93d-acef-4b61-b090-882ed6459b03.png?resizew=369)
(1)利用尺规作图在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6629007ff95940063ac94443c80e2f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae15dd3e0ed9154cb85f311d6de4fc47.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】【提出问题】如图1,直线
是足球场底线,
是球门,点
是射门点,连接
,则
叫做射门角.如图2,在足球比赛场上,甲、乙两名队员互相配合向对方球门
进攻,当甲带球冲到
点时,乙跟随冲到
点,仅从射门角度大小考虑(射门角越大,足球越容易被踢进),甲是自己射门好,还是迅速将球回传给乙,让乙射门好,利用所学知识说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a4832ccd-6167-4ad0-ae1b-538eb52cf5af.png?resizew=478)
【经验感知】如图3,若球员在直线
上跑动,随时准备射门,是否存在某一点
,使得射门角
最大.人们发现:当且仅当经过
两点的圆与直线
相切于点
时,
最大,并称此时的
为最大射门角.如图4,
为球门,直线
是足球场的底线,直线
,垂足为
,若
,球员丙带球沿直线
向底线
方向运球,已知丙运球过程中的最大射门角是
.
(1)尺规作图:作经过
两点并且与直线
相切于点
的
(不写作法,保留作图痕迹);
(2)求出最大射门角
的度数.
【理解应用】
(1)如图5,正方形网格中,点
均在格点上,
为球门,球员丁带球沿
方向进攻,最好的射点在( )
A.点
B.点
或点
C.线段
(异于端点)上一点 D.线段
(异于端点)上一点
(2)如图6,矩形
是足球场的示意图,其中宽
,球门
,且
.点
分别是
上的点,
,一位左前锋球员戊从点
处带球,沿
方向跑动,球员戊在
上何处才能使射门角(
)最大,直接写出此时
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a4832ccd-6167-4ad0-ae1b-538eb52cf5af.png?resizew=478)
【经验感知】如图3,若球员在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb26a220ed44c446105df7caa0f1063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213a845660f5823974927790ba94b520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
(1)尺规作图:作经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求出最大射门角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
【理解应用】
(1)如图5,正方形网格中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d75df9d80ce1e0b7cb50464e293864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
A.点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图6,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71936abeea6d0d55798217b31a9e1d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1edf37c104d215fed83a125f88b651d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b795e2cfa58b494fd8f5437b3db0d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a68766e56e4d3a822cfc2319faaf330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c52e1ac6e3dc5140344d1e31fa9a96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d4aca03910382accfe738520daf689c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/d4d4bc5c-d392-47bb-a1c1-08e030b43718.png?resizew=423)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】在
中,
,点
在
边上,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/323dff53-a6d1-40ee-8b89-241ac079862e.png?resizew=590)
(1)如图1,求证:
为等边三角形;
(2)如图2,点
在
边上,连接
交
于
,若
,求
的度数;
(3)如图3,在(2)的条件下,点
是
中点,点
在
延长线上,连接
,且
,过点
作
于点
,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fb52b79670703261604794f188d896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/323dff53-a6d1-40ee-8b89-241ac079862e.png?resizew=590)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,点
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e6363330b33ca9feda927e6ffd3088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7724af2445c723d1392aed54d210ed3a.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0c7b501ceda20dba906e5a90329edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6f584802de2e7335d5b6ba33c9ac50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9634543e92e327f52eea92aa2fee7d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96588a6ba659e4514d95ea9b12bb104b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,形如三角板的
中,
厘米,形如量角器的半圆
的直径
在直线
上,且
厘米,点
在三角形的左侧,
厘米.若半圆
沿
方向以每秒2厘米的速度向右运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/0b6a1974-c8e9-471d-b40f-2bc33767b379.png?resizew=246)
(1)当
______时,半圆
与直线
相切;
(2)当
时,试判断直线
与半圆的位置关系并说明理由;
(3)当
时,求半圆与三角形重合部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd805a87740eab1f14e0e4733381a336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4f58ec0a81d46ff0557b9220ba606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ab0cbcf1eaecea7423b50fcf955a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/0b6a1974-c8e9-471d-b40f-2bc33767b379.png?resizew=246)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a495c197fcbacb8c109aa0060525a371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d535a4d2666de49bb57c25c8808f0feb.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图所示,在菱形
中,
,
是等边三角形.
(1)如图
,点
、
分别在菱形的边
、
上滑动,且
、
不与
、
、
重合.求证:
;
(2)如图2,点
是
延长线上一点,连
.
①求证:
;
②若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/d9f0eee8-34fc-4a59-8a8e-53d0d56d15c0.png?resizew=500)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab8149c14e1332833af0ee3fb7d3e63.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】在平面直角坐标系xOy中,若某菱形至少有一组对边与x轴或y轴平行(或共线),则称该菱形为规则菱形.若点P、Q为某规则菱形相对的顶点,且以P、Q为顶点的内角度数为
,则称点P、Q与该规则菱形“
-相关”.根据定义回答下面的问题:
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967914584662016/2971546794008576/STEM/39b2cb1c-ed27-4ea4-a703-0b5e787f1784.png?resizew=722)
(1)如图1,已知点A的坐标为
.
①若点B的坐标为
,是否存在与点A,B“90°-相关”的规则菱形?______(填“是”或“否”).
②已知点
,若存在与点A、C“90°-相关”的规则菱形,则点C的坐标为______.
(2)如图2,矩形EFGH的顶点坐标分别为
,
,
,
.已知点
,点N在矩形EFGH的边上,若存在与点M,N“60°-相关”的规则菱形,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967914584662016/2971546794008576/STEM/39b2cb1c-ed27-4ea4-a703-0b5e787f1784.png?resizew=722)
(1)如图1,已知点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0a7f9ee3c6ccaea8dd3d5ad042e5f2.png)
①若点B的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294c864099b022a852984aae8c9401c.png)
②已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f61275e3e521cd2e0dacb683604075.png)
(2)如图2,矩形EFGH的顶点坐标分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72480c8fae3dc057229a7958e9daed74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82dab5b50b2ba09b384a3ee2a8860263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75c04a3736ad32412accf1937da88ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa2e31608e60e3fd40c040cfe9d6e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c8ec975872ee7cc525d67ad9761d22.png)
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【推荐1】如图1,在
中,
,
,
,
分别为
,
边上一点,连接
,且
,将
绕点
在平面内旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/51605218-ee14-493e-8ada-7ef4af37edb2.png?resizew=613)
(1)观察猜想
若
,将
绕点
旋转到如图2所示的位置,则
的值为______.
(2)类比探究
若
,将
绕点
旋转到如图3所示的位置,求
的值.
(3)拓展应用
若
,
为
的中点,
,当
中,请求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/51605218-ee14-493e-8ada-7ef4af37edb2.png?resizew=613)
(1)观察猜想
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5516b52e2c32417b3ccf507a75bf5033.png)
(2)类比探究
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5516b52e2c32417b3ccf507a75bf5033.png)
(3)拓展应用
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4151e948feebdf7b91fbe739feafa9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解题方法
【推荐2】如图,四边形
为正方形,
为对角线
上的动点,过点
作
,
交射线
于
,交射线
于
.
(1)求证;
;
(2)求证;
;
(3)若
,当
时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d3a004c4f6c29bd52364eb658c704b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a13d6e5b1d375e5de0b062d7f36e62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)求证;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
(2)求证;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01722033ed9a23d439b5b1124b879edb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bf0b9de0bbbf33376297f9f7abcd2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/9ab07912-e1d4-449d-8df8-c810902b8e8f.png?resizew=177)
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【推荐3】如果三角形的两个内角
与
满足
,那么我们称这样的三角形为“CJ三角形”.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985712374800384/2989076153565184/STEM/1d42e88e-3dc8-4e91-aeea-629162ec0dc5.png?resizew=405)
(1)判断下列三角形是否为“CJ三角形”?如果是,请在对应( )内画“√”,如果不是,请在对应( )内画“×”;
①其中有两内角分别为30°,60°的三角形( );
②其中有两内角分别为50°,60°的三角形( );
③其中有两内角分别为70°,100°的三角形( );
(2)如图1,点A在双曲线
(
)上且横坐标为1,点B(4,0),C为OB中点D为y轴负半轴上一点,若∠OAB=90°.
①求k的值并求证:△ABC为“CJ三角形”;
②若△OAB与△OBD相似,直接写出D的坐标;
(3)如图2,在Rt△ABC中,∠ACB=90°,AC=6,BC=8,E为BC边上一点,BE>CE且△ABE是“CJ三角形”,已知A(
,0),记BE=t,过A,E作抛物线
(
),B在A右侧,且在x轴上,点Q在抛物线上,使得tan∠ABQ=
,若符合条件的Q点个数为3个,求抛物线
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106f8de7fde5a4d67448debb9437194e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985712374800384/2989076153565184/STEM/1d42e88e-3dc8-4e91-aeea-629162ec0dc5.png?resizew=405)
(1)判断下列三角形是否为“CJ三角形”?如果是,请在对应( )内画“√”,如果不是,请在对应( )内画“×”;
①其中有两内角分别为30°,60°的三角形( );
②其中有两内角分别为50°,60°的三角形( );
③其中有两内角分别为70°,100°的三角形( );
(2)如图1,点A在双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
①求k的值并求证:△ABC为“CJ三角形”;
②若△OAB与△OBD相似,直接写出D的坐标;
(3)如图2,在Rt△ABC中,∠ACB=90°,AC=6,BC=8,E为BC边上一点,BE>CE且△ABE是“CJ三角形”,已知A(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829181780de44c9ceba81a68b0f0c30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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