如图,在中,对角线
,请用尺规作图法在
上求作一点
,使得点
到
的距离等于
.(保留作图痕迹,不写作法)
更新时间:2024-03-31 00:00:28
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解答题-问答题
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【推荐1】如图,AD是△ABC的角平分线,DE、DF分别是△ABD和△ACD的高.
(1)试说明AD垂直平分EF;
(2)若AB=6,AC=4,S△ABC=15,求DE的长.
(1)试说明AD垂直平分EF;
(2)若AB=6,AC=4,S△ABC=15,求DE的长.
![](https://img.xkw.com/dksih/QBM/2021/10/25/2836870362054656/2838543701532672/STEM/2507d9576223407bb4ca0e5ea35ca4e0.png?resizew=138)
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解答题-证明题
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【推荐2】如图,在
中,
和
的平分线
相交于点
,
,连接
.
(1)求
的度数;
(2)求证:
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925b8db9b6ed790adf04a5dff4e0e61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456e0f77d83975fdbdb60b499cb5b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/79c511d1-ec1c-42d8-875f-43da982c58cf.png?resizew=126)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec412ebd940d71b983ce4877e3401ee.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解答题-作图题
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【推荐1】已知:如图,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/89f0f800-f5ba-47ac-be94-b0e6363956fa.png?resizew=156)
(1)用直尺和圆规作
的角平分线
和中线
;(不写作法,保留作图痕迹)
(2)画出
的高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/89f0f800-f5ba-47ac-be94-b0e6363956fa.png?resizew=156)
(1)用直尺和圆规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-作图题
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【推荐2】尺规作图:
已知:
.
求作:
内部一点P以及线段
和
,使得
于点E,
于点F且
.
作法:
①以O为圆心,适当长为半径作弧,交
于M,交
于N;
②分别以M,N为圆心,大于
的长为半径作弧,两弧在
的内部交于点C;
③作射线
;
④在射线
上取一点P(不与点O,C重合),过点P作
于点E,
于点F.
请根据尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101946892345344/3156199674519552/STEM/f798a55a6330487881b3d7bc5d350b5b.png?resizew=136)
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下列证明.
证明:连接
.
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70115e1cfff4b0e34b2b30eb8d1ce5ff.png)
∴
.(________)(填推理依据)
∴
.(________________________________)(填推理依据)
∴射线
平分
.
∵点P在
的平分线OC上,且
于点E,
于点F,
∴
(________________________________)(填推理依据)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30155e0e3cf7c5146d3311e5b8da93.png)
作法:
①以O为圆心,适当长为半径作弧,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
②分别以M,N为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
③作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
④在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
请根据尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101946892345344/3156199674519552/STEM/f798a55a6330487881b3d7bc5d350b5b.png?resizew=136)
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下列证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c01f0de240f8f0e6a10310ab23ae0748.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699ccb1d8c438f5bc838cd3c55dacda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0aac4eb03ed57830e5188a218de064d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70115e1cfff4b0e34b2b30eb8d1ce5ff.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2b515eaf8149d940aa5d0e8e7dca34.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac19b08496ce605f9ac0d4e56a6950b2.png)
∴射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
∵点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776e5e9395f9e5f656d3c2436f8ab4ba.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f28bf169525eddd3459069a9b5c0d74.png)
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