一副三角板按如图1所示放置,边
在直线
上,
.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2899421911744512/2902074667819008/STEM/e9141e7a-1a76-4b0b-a638-dd0c7c3da113.png?resizew=449)
(1)求图1中
的度数;
(2)如图2,将三角板
绕点O顺时针旋转,转速为
,同时将三角板
绕点O逆时针旋转,转速为
,当
旋转到射线
上时,两三角板都停止转动.设转动时间为
.
①在
范围内,当
时,求t的值;
②如图3,旋转过程中,作
的角平分线
,当
时.直接写出时间
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a413dce80ffaf4f1794b49aea6e81ac.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2899421911744512/2902074667819008/STEM/e9141e7a-1a76-4b0b-a638-dd0c7c3da113.png?resizew=449)
(1)求图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(2)如图2,将三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b467b9286d4f32ddc9b6b2d42d7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1755c4b405b86d30c1806a598e063b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c104d9088486ac1a7072482d2167aa52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a621bfa70a014bdcdb58697f099b597.png)
②如图3,旋转过程中,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4b76e86ba5a3cf817ce42d0cf07a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
21-22七年级上·重庆·期末 查看更多[12]
重庆市第八中学校2021-2022学年七年级上学期期末数学试题(已下线)第四章 基本平面图形 章末检测卷-2022-2023学年七年级数学上册重难题型全归纳及技巧提升专项精练(北师大版)(已下线)专题11 与角相关的旋转(翻折)问题 专项讲练-2022-2023学年七年级数学上册重难题型全归纳及技巧提升专项精练(北师大版)(已下线)4.3 角(培优三阶练)-2022-2023学年七年级数学上册课后培优分级练(人教版)(已下线)第4章 几何图形初步(基础、典型、易错、压轴)分类专项训练-2022-2023学年七年级数学上学期考试满分全攻略(人教版)江西省抚州市崇仁县第二中学2022-2023学年七年级上学期数学月练二(已下线)清单12 角、平行、垂直(3个考点梳理+18种题型解读+提升训练)-2023-2024学年七年级数学上学期期末考点大串讲(苏科版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(人教版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(北师大版)(已下线)专题6.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(苏科版)(已下线)专题6.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(浙教版)(已下线)专题4.7 动角旋转问题专项训练-2023-2024学年七年级数学上册举一反三系列(沪科版)
更新时间:2022-01-25 14:28:56
|
相似题推荐
解答题-作图题
|
较难
(0.4)
【推荐1】如图,已知数轴上
、
两点所表示的数分别为
和8.
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671338807394304/2672945830682624/STEM/f9ae9ccb8037442988e213d3e5668fc4.png?resizew=221)
(1)线段
的长为________;
(2)若点
是数轴上的一点(点
不与
、
两点重合),
为
的中点,
为
的中点,当点
在射线
上移动时,
的长度是否发生变化?若不变,请画出图形分析,并求出线段
的长度;若改变,请说明理由.
(3)若点
、
分别以每秒1和3个单位长度的速度向左移动,求当移动多少秒时,
、
两点的距离恰好为8?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671338807394304/2672945830682624/STEM/f9ae9ccb8037442988e213d3e5668fc4.png?resizew=221)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】数轴上有四个点P,Q,M,N,我们规定:点P与点Q之间的距离记为d,点P与点M或点N中某一个点的距离记为
,点Q与点M或点N中另一个点的距离记为
,若满足
,则称P和Q是M,N的“伴随点对”.
例如:点P,Q,M,N分别表示的数为8,9,4,2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/3fcb7e8d-69cf-46d2-997e-d72c8b27231d.png?resizew=436)
此时,
,
,
,
,
,其中存在
,满足
,则称P和Q是M,N的“伴随点对”
在数轴上点A,B分别表示的数为
,4.
(1)若点
和
分别表示的数为10和1,点
和
分别表示的数为3和
,点
和
分别表示的数为
和
,则在①
和
,②
和
,③
和
中,是A,B的“伴随点对”的是_____(填序号即可);
(2)若点C表示的数为1,点D表示的数为m,且C和D是A,B的“伴随点对”,直接写出m的取值范围;
(3)若点C从点A出发以每秒4个单位长度向右运动,同时点D从点B出发以每秒1个单位长度向左运动,当点D到达点A时,点C和点D同时停止运动.设点D的运动时间为t秒.当C和D是A,B的“作随点对”时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe313009fe0e292b2b75566ff91becf4.png)
例如:点P,Q,M,N分别表示的数为8,9,4,2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/3fcb7e8d-69cf-46d2-997e-d72c8b27231d.png?resizew=436)
此时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e3f3f09715fd737324ea48c3696485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122e3e53a614abc840775b9d4f7b950c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e8efb3018e9243269c82dcdac89b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47f789d500a0c20fdb13ced1e0a4e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bccef1998c9f98ea96e3500e582d3016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2292a6806df320d1bf38980a12ff6728.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe313009fe0e292b2b75566ff91becf4.png)
在数轴上点A,B分别表示的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ce8c07e34224e2d25130ed27c9a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3aab28a20b5bf47040aaec03b1eb550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8ce8c07e34224e2d25130ed27c9a98.png)
(2)若点C表示的数为1,点D表示的数为m,且C和D是A,B的“伴随点对”,直接写出m的取值范围;
(3)若点C从点A出发以每秒4个单位长度向右运动,同时点D从点B出发以每秒1个单位长度向左运动,当点D到达点A时,点C和点D同时停止运动.设点D的运动时间为t秒.当C和D是A,B的“作随点对”时,直接写出t的值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,已知
是锐角,过点
作射线
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/10/2739845166161920/2739985389977600/STEM/61ad4145-6dd3-4a78-a165-2fad65b43f66.png)
(1)当
,且射线
在
的内部时,找出图中另一对成2倍关系的角,并说明理由;
(2)当射线
在
的外部时,探索
,
,
之间的等量关系;
(3)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415e4ae01afab498161e52ca767bfa4a.png)
![](https://img.xkw.com/dksih/QBM/2021/6/10/2739845166161920/2739985389977600/STEM/61ad4145-6dd3-4a78-a165-2fad65b43f66.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c974788b845e79192a16ae65f347950f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b91fbed3be6168821d6df79a82b1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,∠AOB=90°,∠COD=60°.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083317506048/2918407543676928/STEM/2c921d6f-2fa7-43f3-be5d-f2c1b99360d0.png?resizew=204)
(1)若OC平分∠AOD,求∠BOC的度数;
(2)若∠BOC=
∠AOD,求∠AOD的度数;
(3)若同一平面内三条射线OT、OM、ON有公共端点O,且满足∠MOT=
∠NOT或者∠NOT=
∠MOT,我们称OT是OM和ON的“和谐线”.若射线OP从射线OB的位置开始,绕点O按逆时针方向以每秒12°的速度旋转,同时射线OQ从射线OA的位置开始,绕点O按顺时针方向以每秒9°的速度旋转,射线OP旋转的时间为t(单位:秒),且0<t<15,求当射线OP为两条射线OA和OQ的“和谐线”时t的值.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083317506048/2918407543676928/STEM/2c921d6f-2fa7-43f3-be5d-f2c1b99360d0.png?resizew=204)
(1)若OC平分∠AOD,求∠BOC的度数;
(2)若∠BOC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08dd1e25420bb85b96dea24e5d16abee.png)
(3)若同一平面内三条射线OT、OM、ON有公共端点O,且满足∠MOT=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐2】如图①,O为直线
上一点,过点O作射线
,
,将一直角三角板的直角顶点放在点O处,一边
在射线
上,另一边
与
都在直线
的上方.
![](https://img.xkw.com/dksih/QBM/2023/1/14/3152755314884608/3155442735742976/STEM/73adbbe3040d4bff80b2a4749680b598.png?resizew=540)
(1)将图①中的三角板绕点O以每秒3°的速度顺时针旋转一周,经过t秒后,如图②,
恰好平分
,求t的值;
(2)在(1)的基础上,如果三角板在转动的同时,射线
也绕O点以每秒
的速度顺时针旋转一周(如图③),那么t为多少时,
平分
?请说明理由;
(3)在(2)的基础上,t为多少时,
平分
?请画出图形并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72dbe710cca6662be5cc0c26a0d12a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2023/1/14/3152755314884608/3155442735742976/STEM/73adbbe3040d4bff80b2a4749680b598.png?resizew=540)
(1)将图①中的三角板绕点O以每秒3°的速度顺时针旋转一周,经过t秒后,如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
(2)在(1)的基础上,如果三角板在转动的同时,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(3)在(2)的基础上,t为多少时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77603496a315e39db671c0c1e4256cc5.png)
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较难
(0.4)
【推荐1】如图1,
,点E,F在
上,点G在
上,点P在
之间,连接
.
;
(2)如图2,
平分
交
于点N,
,
平分
,
,求
的度数;
(3)如图3,
平分
交
于点N,
,
平分
,
平分
,
交于点M,
,
,直接写出x : y的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8724154dec48ba6289f510878d6310ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0529feace64172d37bf9faa1e30333f.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482e68d608de7675e15bb759acd8204c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca23db2faa7ffe00ed4852083d9176f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d4ab4f05dbd1a4301ed0dc4c73aa75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593d873ef1e8fca5f01b63c03be39199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df416efbf00259c3b1090cf15c726bdc.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482e68d608de7675e15bb759acd8204c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca23db2faa7ffe00ed4852083d9176f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d4ab4f05dbd1a4301ed0dc4c73aa75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f80fcc149502f668d1d4aa8c0997b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/730d5555abae30924e87bac667e0a3cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d29d31ecab034493ff6ac89b508142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012f3e0009f4ff709e5eabfb5db0d376.png)
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较难
(0.4)
【推荐2】沿河县某初中七年级的数学老师在课外活动中组织学生进行实践探究,用一副三角尺(分别含
,
,
和
,
,
的角)按如图所示摆放在量角器上,边PD与量角器
刻度线重合,边AP与量角器
刻度线重合,将三角尺ABP绕量角器中心点P以每秒
的速度顺时针旋转,当边PB与
刻度线重合时停止运动,设三角尺ABP的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/eb8f40b3-92ce-4fe8-bad8-535b8adffde5.png?resizew=311)
(1)当
时,
__________
;
(2)若在三角尺ABP开始旋转的同时,三角尺PCD也绕点P以每秒
的速度逆时针旋转,当三角尺ABP停止旋转时,三角尺PCD也停止旋转.
①当t为何值时,边PB平分
;
②在旋转过程中,是否存在某一时刻使
,若存在,请求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/eb8f40b3-92ce-4fe8-bad8-535b8adffde5.png?resizew=311)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a495c197fcbacb8c109aa0060525a371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ed5dc05a32116c94417dcb2d721868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)若在三角尺ABP开始旋转的同时,三角尺PCD也绕点P以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1653dd6d530c2e15ef1f073760ae5ad7.png)
①当t为何值时,边PB平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
②在旋转过程中,是否存在某一时刻使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f88ef9427c10859c90954a1ccf74ad.png)
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