如图,已知O为直线AB上一点,过点O向直线AB上方引三条射线OC、OD、OE,且OC平分∠AOD,∠2=3∠1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/cd704e1a-550c-4abe-a058-409c8863b626.png?resizew=520)
(1)若∠AOD=140°,求∠1的度数.
(2)若∠1=15°,求∠COE的度数
(3)在(2)的条件下,若OF为一条过点O的射线,∠COF=2∠1,求∠BOF的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/cd704e1a-550c-4abe-a058-409c8863b626.png?resizew=520)
(1)若∠AOD=140°,求∠1的度数.
(2)若∠1=15°,求∠COE的度数
(3)在(2)的条件下,若OF为一条过点O的射线,∠COF=2∠1,求∠BOF的度数.
更新时间:2022-07-23 18:00:54
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解答题-问答题
|
适中
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【推荐1】如图,已知
和
都是直角,它们有公共顶点
.
![](https://img.xkw.com/dksih/QBM/2022/1/6/2894290141683712/2952208891748352/STEM/458aa323-b6f5-4a81-a6cf-daec511ab806.png?resizew=188)
(1)若
,求
的度数;
(2)判断
和
的大小关系,并说明理由;
(3)探究
和
的数量关系,写出结论并说明理由.
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f94bfc11292c9fa77c7c38d116f2058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(3)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
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解答题-作图题
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【推荐2】利用折纸可以作出角平分线.
(1)如图1,若
,则
______;
(2)折叠长方形纸片,
,
均是折痕,折叠后,点A落在点
,点
落在点
,连接
.
①如图2,当点
在
上时,判断
与
的关系,并说明理由;
②如图3,当点
在
的内部时,连接
,若
,
,求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/aa49dde6-1dec-429a-980a-3dfe54d7f5ed.png?resizew=500)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/4a2bf9b4-c54e-4907-bc4a-6575435bbbbb.png?resizew=295)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ce839138065697881cc3f02ee3ccde.png)
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(2)折叠长方形纸片,
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①如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fce10478485ef01d2318fc3465bb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
②如图3,当点
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解答题-问答题
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【推荐2】如图,直线
,点
、
分别在直线
、
上,点
在
和
之间,且满足
,
,点
为线段
上一点(端点除外),
的平分线与
的平分线交于点
.
时,求
;
(2)请用等式表示
与
的数量关系;
(3)若
时,判断线段
与
的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3907909bc37318fc73d9be9025989af0.png)
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(2)请用等式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc3bab5dbb647ae42ece614df3f25611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db0641078052bf1af17b4c5a01b9ccc.png)
(3)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-作图题
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适中
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【推荐1】阅读下面材料:小聪遇到这样一个问题:∠AOB为钝角,只用三角板在∠AOB内部画一个∠COD,使得∠AOB与∠COD互补.
小聪是这样思考的:如图1,利用三角板画出∠BOC=90°,∠AOD=90°,这样就得到了∠AOB与∠COD互补.
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911108857643008/2921836437233664/STEM/fba1f215-9eb7-4078-bd57-ac4ecff51d9e.png?resizew=342)
(1)请你判断小聪的作法是否正确,并说明理由;
(2)在图1中,若∠BOD+∠AOC=50°,求∠COD的度数;
(3)参考小聪的画法,请在图2中,只用三角板在∠EOF内部画一个∠GOH,使∠GOH与∠EOF互余.(保留画图痕迹)
小聪是这样思考的:如图1,利用三角板画出∠BOC=90°,∠AOD=90°,这样就得到了∠AOB与∠COD互补.
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911108857643008/2921836437233664/STEM/fba1f215-9eb7-4078-bd57-ac4ecff51d9e.png?resizew=342)
(1)请你判断小聪的作法是否正确,并说明理由;
(2)在图1中,若∠BOD+∠AOC=50°,求∠COD的度数;
(3)参考小聪的画法,请在图2中,只用三角板在∠EOF内部画一个∠GOH,使∠GOH与∠EOF互余.(保留画图痕迹)
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解答题-作图题
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【推荐2】如图1,B,O,C在同一条直线上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/bf8385dd-33ad-4aa3-94e4-60ac7c7aa5cd.png?resizew=498)
(1)若
平分
,如图2,求
与
的度数;
(2)若
平分
平分
,如图3,求
的度数;
(3)如图4,
与
互余,若
也与
互余,请在图4中画出射线
,直接写出
的度数(用含
的式子表示).
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/bf8385dd-33ad-4aa3-94e4-60ac7c7aa5cd.png?resizew=498)
(1)若
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(2)若
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(3)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2f7bab4ed36ec5d04db3aeed2796f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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名校
【推荐1】如图,直线
,
相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/ff2577b0-3110-433e-b6a0-18613c39a298.png?resizew=131)
(1)若
,求
的度数;
(2)在(1)的条件下,若
,求
的度数.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd6ec8fa1147280a0eaba74744b2d50.png)
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(1)若
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(2)在(1)的条件下,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
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解答题-问答题
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【推荐2】如图,直线
和直线
相交于点
,
平分
.
:
:
,求
的度数.
(2)若OE⊥CD, 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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeba80a6e2fb82342c366b830760fa2f.png)
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(2)若OE⊥CD, 求
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