如图所示,将一副三角板的直角顶点重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/11cef69f-5e6c-458f-8379-32de46fd4809.png?resizew=162)
(1)写出以C为顶点的相等的角.
(2)若
,求
的度数.
(3)写出
与
之间所具有的数量关系,说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/11cef69f-5e6c-458f-8379-32de46fd4809.png?resizew=162)
(1)写出以C为顶点的相等的角.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ad9b1e635979596375d8b804de3216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
(3)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
更新时间:2022-04-08 13:22:07
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相似题推荐
解答题-作图题
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【推荐1】在数学活动课上,小明将一副三角尺的直角顶点O重合在一起,并对形成的角进行了系列化探究.
【探究一】
如图1,三角尺的斜边
,
在同一直线上,则
__________.
【探究二】
如图2,将三角尺
绕点O逆时针旋转,
与
交于点E,若
,则
__________.
【探究三】
在图2的基础上,将三角尺
继续绕点O逆时针旋转,使点B落在边
上,
与
交于点E.利用图3补全图形,写出
与
间的等量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747273412608/2790443780734976/STEM/b807f11e-819d-4f92-b624-6023f5fd68b4.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747273412608/2790443780734976/STEM/098d42b9-d8c8-4339-9ba9-684628b78476.png)
【探究一】
如图1,三角尺的斜边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
【探究二】
如图2,将三角尺
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbb5d97a06c189af2032a1b551ca0ff.png)
![](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/9f98ba6ec4c893f3f42881072b26f1cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c122873803fb37d6d916b1d919c08ba5.png)
【探究三】
在图2的基础上,将三角尺
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbb5d97a06c189af2032a1b551ca0ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](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/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747273412608/2790443780734976/STEM/b807f11e-819d-4f92-b624-6023f5fd68b4.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747273412608/2790443780734976/STEM/098d42b9-d8c8-4339-9ba9-684628b78476.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718747273412608/2790443780734976/STEM/a7c14b26-ba31-456d-9d37-e0afd69f82a3.png)
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解答题-问答题
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【推荐2】如图,
和
都是直角.
如图1,如果
,求
的度数;
找出图1中相等的锐角,并说明相等的理由;
在图2中,利用三角板画一个与
相等的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82370110800a9b387da342ca717bdeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0212bf3291e38526e19bcd4e97d27d45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98120b5fd8d081959733349b4d9983c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b5ab330e9b7a07c526fbdd861fb1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e5a9c48658bc79f8815652156650f5.png)
![](https://img.xkw.com/dksih/QBM/2019/3/22/2165945393078272/2166594728730624/STEM/2d00872018eb4d59aacb93b2ad9e8282.png?resizew=431)
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解答题-问答题
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【推荐3】【动手实践】
在数学研究中,观察、猜想、实验验证、得出结论,是我们常用的几何探究方式.
请你利用一副含有
角的直角三角板
和含有
角的直角三角板
尝试完成探究.
(1)如图1,当边
和边
重合时,
______度;
(2)如图2,保持三角板
不动,将
角的顶点与三角板
的
角的顶点重合,然后摆动三角板
,当
是多少度时
,
?请说明理由;
【拓展延伸】
(3)如图3,试探索:保持三角板
不动,将
角的顶点与三角板
的
角的顶点重合,然后摆动三角板
,使得
与
中其中一个角是另一个角的两倍,请直接写出所有满足题意的
的度数.
在数学研究中,观察、猜想、实验验证、得出结论,是我们常用的几何探究方式.
请你利用一副含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20bea1a042a5c5e63cad31714fc67b66.png)
(1)如图1,当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021bc0ff7e36c9d6d70ddd2e51e8c04c.png)
(2)如图2,保持三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f84ebfba6e2753a3eeb688c93504faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f84ebfba6e2753a3eeb688c93504faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bac94313d4e5cc1bfea29d0eaa2c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eff1f7b79d97465a24f1fdf5a2a88bdc.png)
【拓展延伸】
(3)如图3,试探索:保持三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc83f34b5a3c1dc09d990ce4bdc8e078.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f84ebfba6e2753a3eeb688c93504faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f84ebfba6e2753a3eeb688c93504faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bac94313d4e5cc1bfea29d0eaa2c45.png)
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解答题-作图题
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【推荐1】如图,点C在射线OA上,CE平分∠ACD. OF平分∠COB并与射线CD交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/33499ceb-3da5-4831-8c7a-870e4738c5d4.png?resizew=130)
(1)依题意补全图形;
(2)若∠COB+∠OCD=180°,求证:∠ACE=∠COF.
请将下面的证明过程补充完整.
证明:∵CE平分∠ACD,OF平分∠COB,
∴∠ACE=______________,∠COF=
∠COB.
(理由: _____________________________________)
∵点C在射线OA上,
∴∠ACD+∠OCD=180°.
∵∠COB+∠OCD=180°,
∴∠ACD=∠____________.
(理由: ___________________________________)
∴∠ACE=∠COF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/33499ceb-3da5-4831-8c7a-870e4738c5d4.png?resizew=130)
(1)依题意补全图形;
(2)若∠COB+∠OCD=180°,求证:∠ACE=∠COF.
请将下面的证明过程补充完整.
证明:∵CE平分∠ACD,OF平分∠COB,
∴∠ACE=______________,∠COF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(理由: _____________________________________)
∵点C在射线OA上,
∴∠ACD+∠OCD=180°.
∵∠COB+∠OCD=180°,
∴∠ACD=∠____________.
(理由: ___________________________________)
∴∠ACE=∠COF.
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解答题-问答题
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【推荐2】如图,点
在直线
上,
,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/41bf5906-fbc3-4c18-832c-5165d50a80f6.png?resizew=156)
(1)若
,求
的度数;
(2)若
,则
___________(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314c7981736d8ceaebd10c496a0efa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/41bf5906-fbc3-4c18-832c-5165d50a80f6.png?resizew=156)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c63c1c0e8ce1c677a9150aa8df14ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f16196c0d534da9ffd46af36c4e538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7c903121c158dafe5e7f3712897ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-作图题
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适中
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【推荐3】在图1中,已知
和
内一点P,以P为顶点画
,使
的两边分别和
的两边垂直.
(1)按要求将图1补充完整,则
与
之间的数量关系是____________;
(2)若点P在
的外部,以P为顶点画
,使
的两边分别和
的两边垂直.请分别在图2和图3中画出符合要求的图形,(1)中的结论还成立吗?请给出证明.
(3)由以上三种情形可以得到一个结论:如果一个角的两边分别与另一个角的两边垂直,那么这两个角______.
(4)应用:如果一个角的两边分别垂直于另一个角的两边且这两个角的差为50°,那么这两个角的度数分别是____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/d86ab16c-d42c-4575-ad1c-1704b5de2208.png?resizew=550)
(1)按要求将图1补充完整,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)若点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(3)由以上三种情形可以得到一个结论:如果一个角的两边分别与另一个角的两边垂直,那么这两个角______.
(4)应用:如果一个角的两边分别垂直于另一个角的两边且这两个角的差为50°,那么这两个角的度数分别是____________.
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