如图,在
中,
,
,
是
边上的高.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7dfd086b-6bb0-4ca0-adef-107ab081c969.png?resizew=148)
(1)尺规作图:作
的角平分线交
于点
.(保留作图痕迹,不写作法,不写结论);
(2)在(1)的条件下,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ad623f3a05ecdc27b3f3e0169669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/7dfd086b-6bb0-4ca0-adef-107ab081c969.png?resizew=148)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)在(1)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
更新时间:2022-11-13 10:03:12
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相似题推荐
解答题-问答题
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【推荐1】如图,直线AB和CD相交于点O,
,OD平分
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/37e02a79-284f-48fe-8a47-30a9069045ff.png?resizew=249)
(1)求
的度数;
(2)求
的度数;
(3)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95a92fcd0cd5e55f1d32d42504a5690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7639c9377144ace567c2d0808647aa77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/37e02a79-284f-48fe-8a47-30a9069045ff.png?resizew=249)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
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【推荐2】如图,已知∠AOB=120°,∠COD=50°,OM平分∠BOD,即∠1=∠2, ON平分∠AOC,即∠3=∠4.
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953059410313216/2953593125511168/STEM/e205cdc5-4243-4d06-8344-ed74b26189f6.png?resizew=296)
(1)若∠BOD=30°,求∠MON的大小;
(2)若∠COD可以在∠AOB内部绕点O作任意旋转(射线OC与射线OA不重合,射线OD与射线OB不重合)则∠MON的大小是否改变?试说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953059410313216/2953593125511168/STEM/e205cdc5-4243-4d06-8344-ed74b26189f6.png?resizew=296)
(1)若∠BOD=30°,求∠MON的大小;
(2)若∠COD可以在∠AOB内部绕点O作任意旋转(射线OC与射线OA不重合,射线OD与射线OB不重合)则∠MON的大小是否改变?试说明理由.
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【推荐2】如图,△ABC中,点D为BC边上一点,过点D作BC的垂线,交AC于点E,交BA的延长线于点F,并且AE=AF.
求证:AB=AC .
求证:AB=AC .
![](https://img.xkw.com/dksih/QBM/2017/4/20/1669652750147584/1670755318562816/STEM/c7993fc082f245c5973632d4ee0bf9c3.png?resizew=118)
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解答题-作图题
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【推荐1】如图,已知
中,
.利用尺规在
边上找一点D,使
与
的面积之比为
(保留作图痕迹,不写作法);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f5cbba30b64fe4239a6317062ee8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/649075bc-3135-4c7b-b2ef-66223c0fdda0.png?resizew=184)
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【推荐2】下面是小欣设计的“利用等腰三角形做菱形”的尺规作图过程.
已知:等腰![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95776e25881da3917df116ebd01fba41.png)
求作:点
,使得四边形
为菱形.
做法:①作
的角平分线
,交线段
于点
;
②以点
为圆心,
长为半径圆弧,交
的延长线于点
;
③连接
,所以四边形
为菱形,点
即为所求.
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467730698657792/2468595948519424/STEM/26c3bbb7-8cdf-4eda-9487-a797e186051c.png?resizew=155)
根据小新设计的尺规作图过程.
(1)使用直尺和圆规补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:
平分
,
(______________________________________)(填推理的依据)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e9883e1033d6bc20ac04bee946b5d3.png)
∴四边形
为平行四边形(______________________________________)(填推理的依据)
,
∴四边形
为菱形(______________________________________)(填推理的依据)
(3)请你设计一种不同于小欣的,利用等腰
(其中
)作菱形
的方法.
要求:写出简要思路,并尺规作图.
已知:等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95776e25881da3917df116ebd01fba41.png)
求作:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
做法:①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514e17265d4ca55292afc778c1af5f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467730698657792/2468595948519424/STEM/26c3bbb7-8cdf-4eda-9487-a797e186051c.png?resizew=155)
根据小新设计的尺规作图过程.
(1)使用直尺和圆规补全图形;(保留作图痕迹)
(2)完成下面的证明.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7304d89ffd5234aec9487b269acfcc5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9940706ead3012be894a4e283006bf23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e9883e1033d6bc20ac04bee946b5d3.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/490f3a8c1701d4cba2a0d02a0f892287.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)请你设计一种不同于小欣的,利用等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
要求:写出简要思路,并尺规作图.
![](https://img.xkw.com/dksih/QBM/2020/5/21/2467730698657792/2468595948519424/STEM/77a6c270-e4ac-4c9b-b13b-1dae2eae1a73.png?resizew=168)
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【推荐1】已知:如图,在△ABC 中,AB=AC,∠BAC=90°,D 是BC 上一点,EC⊥BC,EC=BD,DF=FE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/1b39e993-3c18-4a8f-a791-9a7001e5d1fd.png?resizew=286)
求证:(1)△ABD≌△ACE;
(2)AF⊥DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/1b39e993-3c18-4a8f-a791-9a7001e5d1fd.png?resizew=286)
求证:(1)△ABD≌△ACE;
(2)AF⊥DE.
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【推荐2】如图1所示,在
中,
,
的垂直平分线交
于点
,交
或
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2021/7/3/2756168286289920/2822157721804800/STEM/5f640e89-169b-4788-8b8c-652ac702d57c.png)
(1)如图1所示,若
,求
的大小;
(2)如图2所示,如果将(1)中的
的度数改为
,其余条件不变,再求
的大小;
(3)你发现了什么规律?写出猜想,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2021/7/3/2756168286289920/2822157721804800/STEM/5f640e89-169b-4788-8b8c-652ac702d57c.png)
(1)如图1所示,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ed7679083e92787c25de7c78cfc67.png)
(2)如图2所示,如果将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aa0b9869db50a9ab48cc32925d8e96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030ed7679083e92787c25de7c78cfc67.png)
(3)你发现了什么规律?写出猜想,并说明理由.
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