如图,以直线
上一点O为端点作射线
,使
,在同一个平面内将一个直角三角板的直角顶点放在点O处.(注:
)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/5b3e6720-ecfc-4012-8ebd-7d38c30eb598.png?resizew=459)
(1)如图1,如果直角三角板
的一边
放在射线
上,那么
的度数为______;
(2)如图2,将直角三角板
绕点O按顺时针方向转动到某个位置,如果
恰好平分
,求
的度数;
(3)如图3,将直角三角板
绕点O任意转动,如果
始终在
的内部,请直接用等式表示
和
之间的数量关系.
![](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/1bb78c88082797255d424968f61ee6e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/5b3e6720-ecfc-4012-8ebd-7d38c30eb598.png?resizew=459)
(1)如图1,如果直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
(2)如图2,将直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
(3)如图3,将直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711e331195e55e1c0133b0286d61a55.png)
![](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/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
21-22七年级上·吉林四平·期末 查看更多[4]
吉林省四平市铁西区2021-2022学年七年级上学期期末数学试题山西省晋中市榆次区山西现代双语学校南校2022-2023学年七年级上学期1月期末数学试题江苏省徐州市丰县七校2023-2024学年七年级上学期12月月考数学试题(已下线)专题5.32 相交线与平行线中的旋转问题(分层练习)(综合练)-2023-2024学年七年级数学下册基础知识专项突破讲与练(人教版)
更新时间:2023-12-31 13:13:23
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相似题推荐
解答题-问答题
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【推荐1】如图,将一幅直角三角板叠放在一起,使直角顶点重合于点
.
![](https://img.xkw.com/dksih/QBM/2023/4/21/3221347754434560/3255975453057024/STEM/1a0aba6e0cd64491ac5181100d58b091.png?resizew=204)
(1)若
,求
的度数;
(2)请问
与
是否相等,并说明理由;
(3)请求出
与
的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2023/4/21/3221347754434560/3255975453057024/STEM/1a0aba6e0cd64491ac5181100d58b091.png?resizew=204)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b21f129dc4cdfe6b98f58f2ecc26cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
(2)请问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(3)请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
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【推荐1】(1)问题发现:由“三角形的一个外角等于与它不相邻的两个内角的和”联想到四边形的外角.
如图①,
是四边形
的两个外角.
∵四边形
的内角和是
,
∴
,
又∵
,
由此可得
与
的数量关系是 ;
(2)知识应用:如图②,已知四边形
,
分别是
和
的平分线,若
,求
的度数;
(3)拓展提升:如图③,四边形
中,
,
和
是它的两个外角,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a256715cd1a78acc36f1b093c94cc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a2e626defedf7138cf0a1485811fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
,求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/2b8be198-6577-4463-940b-f8f9f819dcff.png?resizew=496)
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541d4e12aeca3128dbcc81a68e20392c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99549ae6cd9aa72dfa39ed5e77d9b7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbab5a97a416ddc9fef6ab7837459ac8.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949209fe7e1bece9cd71050bae035f7f.png)
由此可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541d4e12aeca3128dbcc81a68e20392c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae41b054ab7bb589c25e0a96e9a5b7ac.png)
(2)知识应用:如图②,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44dd91b428bfd6f420ffbbb22ff3d4aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899a47e94a52c76b4044d256ce7717bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10cb594bbd4d00d15e10185faee7b22c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d304021211b97aecd2fa44a9e046ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07e8e8e24dabdfa33c8de2ca38ef0d7.png)
(3)拓展提升:如图③,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e81b1b9606ad25244ff82c8292df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f1df02e4001eddcb3421e287da0b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3c8ccc16b83eaa0804e881a7be2325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a256715cd1a78acc36f1b093c94cc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f1df02e4001eddcb3421e287da0b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a2e626defedf7138cf0a1485811fbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3c8ccc16b83eaa0804e881a7be2325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22cf607df3b46b20f5545da43f67766.png)
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【推荐2】如图,对正方形纸片
进行如下操作:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/cfaae536-ae06-4f56-80ec-dd13f9accb8b.png?resizew=537)
(i)过点
任作一条直线与
边相交于点
(如图①),记
;
(ii)作
的平分线交
边于点
(如图②),记
;
(iii)作
的平分线交
边于点
(如图③),记
;
按此作法从操作(2)起重复以上步骤,得到
,现有如下结论:①当
时,
;②
; ③当
时,
;④当
时,
.其中正确的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/cfaae536-ae06-4f56-80ec-dd13f9accb8b.png?resizew=537)
(i)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0d49fb8af0be67d0424ba5896ece87.png)
(ii)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be8cff10ed59b6b8aabb7b88c248d977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2ee7d22c7a32a70b9c2be6b02b293c.png)
(iii)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306e6603695d34c8a17fa483bb1bdadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4dbe5d5c8b9c28c6f5eb92278a9f17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35907c238fe6b77794346831dcc771b1.png)
按此作法从操作(2)起重复以上步骤,得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be63d332d4f803b740310795d928502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf05cbc39941870b43e4c38104609d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e36be1484216b647103fdd7d6ce871a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebd07139cd7ea20ae15ec24613ed57d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c03cfdcb85fde41bb084d6fc8a74dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655445bbbfb0341c0256c02edacc77a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d1a99fa7ce3467f83b50dd40fe2633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48685592ca28f762c10c9b37f4327e20.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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