如果两个角的差的绝对值等于
,我们称这两个角互为友好角,例如:
,
,
,则
和
互为友好角(本题中所有角都指大于
且小于
的角).将两块直角三角板如图1摆放在直线
上,其中
,保持三角板
不动,将三角板
绕
点以每秒
的速度顺时针旋转,旋转时间为
秒.
![](https://img.xkw.com/dksih/QBM/2019/4/3/2174537143754752/2175210664951808/STEM/94adb127793747b5aa7b4b8e60c497b9.png?resizew=615)
(1)如图2,当
在直线
左侧时
①与
互为友好角的是_________,与
互为友好角的是_________.
②当
____________时,
与
互为友好角.
(2)若在三角板
开始旋转的同时,另一块三角板
也绕点
以每秒
的速度逆时针旋转,当
旋转至射线
上时两三角板同时停止.当
为何值时,
与
互为友好角(自行画图分析)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb0fbb4fd913373d5d5aabdc91c08be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f010a383d5c87e1a2352e95e1b0e5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ac7b21ac76bb604eb02b0d2b22210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3835366a95e8d85293366a46fc0a81d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e7a123c9cc0e058db28841fb0edcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdf149817d5ed6cf7d9c8af1b4268f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f6a9fcd59fc2476fc307fa8a3a9250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d121460cf2695f5ca487145596360fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2019/4/3/2174537143754752/2175210664951808/STEM/94adb127793747b5aa7b4b8e60c497b9.png?resizew=615)
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
①与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
(2)若在三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a93bf8f635816968d9dbcb0b1cda4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a52e349973e2c589b48066c9068a8e.png)
18-19七年级上·浙江宁波·期末 查看更多[2]
【区级联考】浙江省宁波市北仑区2018-2019学年七年级上学期期末考试数学试题(已下线)【新东方】【2019】【初一上】【第三次月考】【XH】【数学】【刘九江图片收集】【xx录入】【xx审核】
更新时间:2019-04-04 15:40:20
|
【知识点】 几何图形中角度计算问题解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】新定义:若两个角的和为
,我们则称这两个角互为“百度角”;例如
,
,则
与
互为“百度角”.(本题中所研究的角都是大于
而小于
的角.)
,
与
互为“百度角”,则
______.
(2)
为
内部的两条射线,若
与
互为“百度角”,射线
平分角
,且满足
,求
的值.
(3)如图2,已知
,射线
从
出发,以每秒
的速度绕O点顺时针旋转,同时,射线
从
出发,以每秒
的速度绕O点逆时针旋转,设运动的时间为t秒
.若
三条射线形成的角互为“百度角”求运动的时间t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85e283d58ea8a48989988ce61df58688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5784ea22dbd90af6cdceae43f80a22e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99a646e773be04af27837f6a46d05e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1e2a60c37ebc303d4fc2bf3d6a234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45739116f428f7c6c5964de72a1fa101.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0510bf733750c342559cecb897f9186.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/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609155bcdf392b31baacf8e77f4197c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(3)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6978615637bd3febf56d23798f65306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1424234bf55319f09a269c87ee7cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa1384725304ba30f283a8c80fa8023.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】将一副三角板如图1摆放,
,
,
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/2023/1/12/3151231848570880/3153318098141184/STEM/ee6dde01fe44419e9055db25ccef4a96.png?resizew=374)
(1)
;
(2)将图1中的三角板
绕点旋转到图2的位置,若
,求
的度数;
(3)如图2,若
,求
与
的差.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51630723c81c43652cac2d31c6f4a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1e2a60c37ebc303d4fc2bf3d6a234.png)
![](https://img.xkw.com/dksih/QBM/2023/1/12/3151231848570880/3153318098141184/STEM/ee6dde01fe44419e9055db25ccef4a96.png?resizew=374)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44231ead105edb73688a91dd3009c68a.png)
(2)将图1中的三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad2ee8833934018c1dd23b69b72e4a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bb76c7960ede2f434e348e005dd607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
您最近一年使用:0次