将一副三角板中的两个直角顶点
叠放在一起(如图①),其中
,
,
,
,设
.
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894761774014464/2921078778888192/STEM/61399412-2cc2-49f9-9d75-e130324de3c1.png?resizew=307)
(1)填空:
______,
______;(用含
的代数式表示)
(2)若
,求
的度数;
(3)若三角板
不动,三角板
绕顶点
转动一周,当
等于多少度时
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb0c658231f83910d74dd2928a0ec9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac39e3ab40c974003d6613557d72d9d.png)
![](https://img.xkw.com/dksih/QBM/2022/1/15/2894761774014464/2921078778888192/STEM/61399412-2cc2-49f9-9d75-e130324de3c1.png?resizew=307)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b753dbb5a670dd4f5e23bb919e44dda2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386cda9f96731510d52ec18199e18286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f6da979486a874f97acf3c94d27699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(3)若三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
更新时间:2022-02-21 10:52:54
|
相似题推荐
解答题-计算题
|
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【推荐1】完成下列各题:
(1)把一副三角板按如图所示那样拼在一起,试确定图中
,
,
,
的度数及其大小关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/a40364c3-3e4d-4a93-b92d-369a03446ce1.png?resizew=500)
(2)①一家住房的平面结构如所示,这家房子的主人打算把卧室以外的部分都铺上瓷砖,至少需要多少平方米的瓷砖?如果某种瓷砖每平方米的价格是a元,那么购买所需瓷砖至少多少元?
②已知房屋的高度为
,现需要在客厅和卧室的墙壁上贴壁纸,那么至少需要多少平方米的壁纸?如果这种壁纸每平方米的价格是b元,那么购买所需壁纸至少需要多少元?(计算时不扣除门、窗所占的面积)
(1)把一副三角板按如图所示那样拼在一起,试确定图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/a40364c3-3e4d-4a93-b92d-369a03446ce1.png?resizew=500)
(2)①一家住房的平面结构如所示,这家房子的主人打算把卧室以外的部分都铺上瓷砖,至少需要多少平方米的瓷砖?如果某种瓷砖每平方米的价格是a元,那么购买所需瓷砖至少多少元?
②已知房屋的高度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9176a2e9cc39d57c54a12b396e71815.png)
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【推荐2】如图1是由一副三角尺拼成的图案,其中三角尺AOB的边OB与三角尺OCD的边OD紧靠在一起.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119537602560/2650727782121472/STEM/92cb57baf4f54399b751b675734c5d4d.png?resizew=443)
(1)在图1中,
的度数是______;
(2)固定三角尺AOB,把三角尺COD绕着点O旋转,当OB刚好是
的平分线(如图2)时,请求出
的度数和
的度数;
(3)固定三角尺AOB,把三角尺COD绕点O旋转(如图3),在旋转过程中,如果保持OB在 的
内部,那么
的度数是否发生变化?请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645119537602560/2650727782121472/STEM/92cb57baf4f54399b751b675734c5d4d.png?resizew=443)
(1)在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)固定三角尺AOB,把三角尺COD绕着点O旋转,当OB刚好是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7603f6f962d379885b75a1a88dcddb77.png)
(3)固定三角尺AOB,把三角尺COD绕点O旋转(如图3),在旋转过程中,如果保持OB在 的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7603f6f962d379885b75a1a88dcddb77.png)
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【推荐1】如图,直线AB、CD被DQ所截,AB∥CD,∠BDC=50°,点E是直线CD上的动点(点E与点D不重合),连结BE,作∠ABE的角平分线交直线CD于点F.
(1)如图1,点E在点D左侧,若∠DBE=20°,求∠EBF的度数.
①如图2,点E在点D左侧,BG是∠ABF的角平分线,求∠FBG的度数.
②若F'是BF反向延长线上的一点,求∠F'BG的度数.
(1)如图1,点E在点D左侧,若∠DBE=20°,求∠EBF的度数.
①如图2,点E在点D左侧,BG是∠ABF的角平分线,求∠FBG的度数.
②若F'是BF反向延长线上的一点,求∠F'BG的度数.
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772387655892992/2779524199047168/STEM/bb7a87d2-c0fe-4cb4-b262-99793866fcec.png)
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【推荐2】某学习小组发现一个结论:已知直线
,若直线
,则
.他们发现这个结论运用很广,请你利用这个结论解决以下问题:
已知直线
,点
在
、
之间,点
、
分别在直线
、
上,连接
、
.
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025233784832/2540893497729024/STEM/1ebdd74a-6ae1-4fa7-a023-8223bf1a7aa8.png?resizew=555)
(1)如图1,过点
作
,运用上述结论,探究
、
、
之间的数量关系,并说明理由;
(2)如图2,类比(1)中的方法,运用上述结论,探究
、
、
之间的数量关系,并说明理由;
(3)如图3,
平分
,
平分
,当
时,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15234cbaac1f69fabb0abebda7709092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844ab35f3716a4d5541f1c4e0df57260.png)
已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025233784832/2540893497729024/STEM/1ebdd74a-6ae1-4fa7-a023-8223bf1a7aa8.png?resizew=555)
(1)如图1,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb50903843f7b423084a954e46adeb0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a298ed3325baafd125f688496fd52e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcf0b442d5ff2ce8efa1a778b4ecd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f60df144dce72a2bdb020912e057e1.png)
(2)如图2,类比(1)中的方法,运用上述结论,探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a298ed3325baafd125f688496fd52e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcf0b442d5ff2ce8efa1a778b4ecd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f60df144dce72a2bdb020912e057e1.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ffab06abe01c9b48aa4692c73d8b7c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee4d77389031da9a6c2ebe0a4699abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8f52e7ce60a6900566e34d3a5513b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c32805e421aec6bce3624baa0c954f1.png)
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