已知
为直线
上的一点,
是直角,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/9fea4c99-c2b4-465d-82fc-01b7a72ed189.png?resizew=319)
(1)如图①,若
,求
的度数
(2)如图①,猜测
与
的数量关系
(3)当射线
绕点
逆时针旋转到如图②的位置时,
与
的数量关系如何?请说明理由.
![](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/75f55c6ac896ab4277fae2230a6e10b0.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/2024/1/13/9fea4c99-c2b4-465d-82fc-01b7a72ed189.png?resizew=319)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91deaedc779200a8b20a3f9a440ba89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(2)如图①,猜测
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
(3)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b723421b10b3735be77e1c79fa1425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
更新时间:2024-01-12 15:28:52
|
相似题推荐
解答题-问答题
|
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(0.85)
【推荐1】如图,点O是直线
上一点,以O为顶点作
,且
、
位于直线
两侧,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/3fe3877c-a6c6-49f8-8d36-7f69a6013f73.png?resizew=157)
(1)当
时
①求
的度数;
②求
和
的度数;
(2)当
时,直接写出
的度数(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/3fe3877c-a6c6-49f8-8d36-7f69a6013f73.png?resizew=157)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618ede24ca37aa33a3789867be8f66b4.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f435c3556b48f0eccc958240fc6c7d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】如图1,线段
,
,
、
分别是
、
的中点.
【问题发现】
(1)若
,则
________
.
【拓展探究】
(2)当线段
在线段
上运动时,试判断
的长度是否发生变化?如果不变,求出
的长度;如果变化,请说明理由.
【问题解决】
(3)我们发现角的很多规律和线段一样,如图2,
、
分别平分
和
.若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a611adcd952f63098d8ff3348133b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b508ed8006a0bec02d0fac30983911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/bd983442-1c38-4c9c-8838-4d78e97b4b6c.png?resizew=426)
【问题发现】
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
【拓展探究】
(2)当线段
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【问题解决】
(3)我们发现角的很多规律和线段一样,如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d6d7b25220d299a9e8696ee69bbe11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6bb92dcf561d40848c2bded1b20f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
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【推荐1】如图,直线
,
相交于点O,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6099e0c4-ca4b-4e9c-96fa-dc998c2da965.png?resizew=177)
(1)若
,求
的补角的度数;
(2)若
,求
的度数.
![](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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/6099e0c4-ca4b-4e9c-96fa-dc998c2da965.png?resizew=177)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0db02f267c14e901b006661838f0ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15886bb1365d039d8e4450cae287788d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bbdbbe9ad091b371091e832d8ff8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
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解答题-证明题
|
较易
(0.85)
【推荐2】如图,在四边形
中,
,
的平分线交
于点E,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/324148cb-defd-42fe-bfde-7ad108d2a06d.png?resizew=180)
(1)图中有哪些相等的角?(至少写4对相等的角)
(2)
与
相等吗?为什么?
(3)完成下面的证明:
如果
,求证
.
证明:∵
(已知),
∴
_______
(______________).
∵
(已知),
∴
_______
.
∴
(_______________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe2f6543e06a25493855fbbc648be6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/22/324148cb-defd-42fe-bfde-7ad108d2a06d.png?resizew=180)
(1)图中有哪些相等的角?(至少写4对相等的角)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
(3)完成下面的证明:
如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe2f6543e06a25493855fbbc648be6d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927cfc3717e16fd2a70ccd98c7f632a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc15920684ed192656cd4fe50b55943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
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解答题-问答题
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(0.85)
【推荐2】如图所示,已知
、
、
在一直线上,
、
分别是
和
的角平分线.
![](https://img.xkw.com/dksih/QBM/2020/9/27/2558833567408128/2559556780089344/STEM/5b842872e87b456395162f26ede115f9.png?resizew=223)
(1)求
的度数;
(2)分别写出
的余角和补角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
![](https://img.xkw.com/dksih/QBM/2020/9/27/2558833567408128/2559556780089344/STEM/5b842872e87b456395162f26ede115f9.png?resizew=223)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
(2)分别写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2f7bab4ed36ec5d04db3aeed2796f2.png)
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