综合与实践
问题情境:
数学活动课上,王老师展示了一个问题:
如图1,
是等边三角形,点D是
边上一动点(点D不与点B重合),连接
,将线段
绕点D按逆时针方向旋转
得到线段
,连接
,并提出了如下问题:
特例探究:
(1)当点D与点A重合时,请在图2中利用尺规作图 按上述要求补全图形,连接
,请你判断此时四边形
的形状并证明;
类比拓展:
(2)当点D与点A不重合时,如图(1),试猜想
与
之间的数量关系并加以证明;
问题解决:
(3)当
,
时,直接写出
的长.
问题情境:
数学活动课上,王老师展示了一个问题:
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
特例探究:
(1)当点D与点A重合时,请在图2中利用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
类比拓展:
(2)当点D与点A不重合时,如图(1),试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
问题解决:
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c30cd7b77f8f6f0b9286ba4a6103f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/39a78e40-8492-4b85-9ebe-0a5f1e2fb009.png?resizew=452)
更新时间:2024-03-02 21:20:53
|
相似题推荐
解答题-问答题
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解题方法
【推荐1】一边长为4正方形OACB放在平面直角坐标系中,其中O为原点,点A、B分别在x轴、y轴上,D为射线OB上任意一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/5561c839-4250-46e3-8f32-5c1b71931ae9.png?resizew=441)
(1)如图1,若点D坐标为(0,2),连接AD交OC于点E,则△AOE的面积为 ;
(2)如图2,将△AOD沿AD翻折得△AED,若点E在直线y=
x图象上,求出E点坐标;
(3)如图3,将△AOD沿AD翻折得△AED,DE和射线BC交于点F,连接AF,若∠DAO=75°,平面内是否存在点Q,使得△AFQ是以AF为直角边的等腰直角三角形,若存在,请求出所有点Q坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/5561c839-4250-46e3-8f32-5c1b71931ae9.png?resizew=441)
(1)如图1,若点D坐标为(0,2),连接AD交OC于点E,则△AOE的面积为 ;
(2)如图2,将△AOD沿AD翻折得△AED,若点E在直线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(3)如图3,将△AOD沿AD翻折得△AED,DE和射线BC交于点F,连接AF,若∠DAO=75°,平面内是否存在点Q,使得△AFQ是以AF为直角边的等腰直角三角形,若存在,请求出所有点Q坐标;若不存在,请说明理由.
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【推荐2】如图,已知矩形OABC的顶点B(-8,6)在反比例函数
的图象上,点A在x轴上,点C在y轴上,点P在反比例函数
的图象上,且横坐标为a(a<-8),分别过点P作PE⊥x轴于点E, PF⊥y轴于点F,交AB于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/efcc5cc0-3783-4bbe-b413-6cbb04697a31.png?resizew=217)
(1)求反比例函数的解析式;
(2)若四边形PEAG为正方形,求点P的坐标;
(3)连接OP交AB于点M,BM:MA=3:2,求四边形PEAM与四边形BMOC的面积比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/efcc5cc0-3783-4bbe-b413-6cbb04697a31.png?resizew=217)
(1)求反比例函数的解析式;
(2)若四边形PEAG为正方形,求点P的坐标;
(3)连接OP交AB于点M,BM:MA=3:2,求四边形PEAM与四边形BMOC的面积比.
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真题
名校
【推荐1】已知四边形
是平行四边形,点
在对角线
上,点
在边
上,连接
,
,
.
;
(2)如图②,若
,过点
作
交
于点
,在不添加任何辅助线的情况下,请直接写出图②中四个角(
除外),使写出的每个角都与
相等.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa12f8b95f77a72c3a1d2e657cdf622a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec44ae04705b00403a31bd8c880c0a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b86c1bea5b5a937fa197dbbd082fc7.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3b55c73c84613890d281d3e656f797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aaae0a473b64d9d2deee0213e21525c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
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【推荐2】点A坐标为
,点B坐标(0,6),点D坐标
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd50cdef-a7bf-4dec-8ecb-02e0bc92a924.png?resizew=298)
(1)若
,垂足为E,延长OE至点C,连接BC,使得
.求证:
;
(2)若
,且
,连接EB与AO交于点T,求T点坐标(用含t的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00e1beb309e45e52341ce67bc18ce94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180735d52856f4393e40e28e7fcc95bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd50cdef-a7bf-4dec-8ecb-02e0bc92a924.png?resizew=298)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e94633285fd100c13a7cd4d13fad631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208d67fb019c8b336234244c3104987c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b1472e121da0ae5550329cfda5f0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
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【推荐1】已知:如图1,直线
与x轴,y轴分别交于A,C两点,点B与点A关于y轴对称,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/8f1fd724-235f-42d0-82c9-38b5318712d5.png?resizew=590)
(1)求k值;
(2)在直线
上找一点P,使
的面积是
面积的
,则点P坐标为 ;
(3)如图2,点M,N分别是线段
,
上的动点(M不与A,B重合),且满足
.
①当
长为多少时,
?并以此为条件,证明
;
②当
为等腰三角形时,直接写出点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ebce8b2a915356ed39f36c5bad2ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/8f1fd724-235f-42d0-82c9-38b5318712d5.png?resizew=590)
(1)求k值;
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5b7ba12696a28104d8e7d70f85a917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf890fb28f5aff86f9bbf66ce643381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)如图2,点M,N分别是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ff9aa65e0def7b1fb787b335404669.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2281c992172cd91752ec5281253e2a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2281c992172cd91752ec5281253e2a1f.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
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【推荐2】如图1,在平行四边形
中,
,
,
,点P从点D出发沿
向C匀速运动,速度为每秒3个单位长度;同时,点Q从点B出发沿
向点A匀速运动,速度每秒2个单位长度.当点P停止运动时,点Q也随之停止运动.过点P作
交
于点M,连接
,
,设运动的时间为t秒
.
(1)当
时,求t的值.
(2)如图2,连接
,是否存在t值,使得
的面积是平行四边形
面积的
?若存在,求出对应的t;若不存在,请说明理由.
(3)如图3,过点M作
交于点N,是否存在t的值,使得点P在线段
的垂直平分线上?若存在,求出对应的t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975645d6a73a7326974511ca80b37f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad41013be2140bae4e03e88d333bfe3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/295a4cf5-a6bb-4f1d-a90a-f431b1aa1688.png?resizew=538)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257423b842a0675d5ceb18049e43deb.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1490f8bd695ad195aa1a52fe36373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee3c61d2298e75fc4f1643f8ebc2e4.png)
(3)如图3,过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐1】如图,在四边形
中,
,
,对角线
,
交于点
,
平分
,过点
作
交
的延长线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2023/3/25/3202157988429824/3204198555762688/STEM/66b12d6eb90b4d8c99500f58ed23e163.png?resizew=249)
(1)求证:四边形
是菱形.
(2)若
,
,则
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/2023/3/25/3202157988429824/3204198555762688/STEM/66b12d6eb90b4d8c99500f58ed23e163.png?resizew=249)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bb2190c6ac4652a61413b4c5fb01d9.png)
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【推荐2】如图1,菱形纸片
,对其进行如下操作:
把
翻折,使得点
与点
重,折痕为
;把
翻折,使得点
与点
重合,折痕为
(如图2),连结
.设两条折痕的延长线交于点
.
(1)请在图2中将图形补充完整,并求
的度数;
(2)四边形
是菱形吗?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eddf494a3b7e9312189c2f0186cc909.png)
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beec023ec3ee72d98f728fd79374968.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/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ec8157f01e4768749b9861db529ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)请在图2中将图形补充完整,并求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6649e96bd703970aecbdcda7996cbaae.png)
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443620043890688/2444700833660928/STEM/1f2d9a21c9274d43ab7f26706f9a9067.png?resizew=451)
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