【综合与实践】
【动手实验】数学课上,老师带领同学们对角的平分线的性质进行探究:
同学们任作一个
,作出
的平分线
.在
上任取一点
,过点
画出
,
的垂线,分别记垂足为
,
,测量
,
.第一小组的测量结果如下:
通过以上测量,你发现了角的平分线的什么性质?
(1)【实验猜想】我们猜想角的平分线有以下性质:______.
(2)【推理证明】请结合图1,利用三角形全等证明这个性质.
如图1,已知:
,点
在
上,
,
,垂足分别为
,
.求证:
.
(3)【定理应用】如图2,点
是
的角平分线上一点,
,垂足为点
,且
,点
是射线
上一动点,求
的最小值.
【动手实验】数学课上,老师带领同学们对角的平分线的性质进行探究:
同学们任作一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
通过以上测量,你发现了角的平分线的什么性质?
学生 | ![]() | ![]() | 学生 | ![]() | ![]() |
小明 | ![]() | ![]() | 小刚 | ![]() | ![]() |
小红 | ![]() | ![]() | 小丽 | ![]() | ![]() |
(2)【推理证明】请结合图1,利用三角形全等证明这个性质.
如图1,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1f18cef1745d84a0265246684753bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70aa83794b41e477e7b546ecbe435ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374e2198b495b86b0f8308d28035a3db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/77fdc284-cb31-43fc-9128-3ea7f97be67b.png?resizew=131)
(3)【定理应用】如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3224457d394d71df7d2955be6149dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/f81d90f8-ce9d-4a89-b2d4-6c454b73a6ad.png?resizew=123)
更新时间:2023-10-09 08:09:55
|
相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】如图,
是直角三角形,
,
,点P是
上的一个动点(点P与点A、B不重合),过点P分别作
于点E,
于点F,连接
.
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754729671491584/2755457198514176/STEM/476ccacc555a42f08678cff72050b9b7.png?resizew=124)
(1)判断四边形
的形状,并说明理由.
(2)在点P的运动过程中,
有最小值吗?如果有,求出这个最小值,如果没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca0940f5c21431c089d4f7a221df43c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754729671491584/2755457198514176/STEM/476ccacc555a42f08678cff72050b9b7.png?resizew=124)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fce76109c3b574feaca9cd7029c2875.png)
(2)在点P的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
解答题-作图题
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适中
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【推荐2】如图,已知三个点
,
,
.请按下列语句画出图形.
(1)画射线
.
(2)画直线
.
(3)在直线
上找一点
,连结
,使线段
最短.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/0e67dc81-b21a-4c38-a70f-ac453d5d8e5d.png?resizew=156)
(1)画射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
(2)画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在∠AOB的两边OA,OB上分别取OM=ON,∠OME=∠OND,DN和EM相交于点C,CD=CE.求证:点C在∠AOB的平分线上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/e9f9e7f2-b446-4d7f-b96e-f978f9bbe541.png?resizew=151)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:中,
点D是
的中点.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ca0f2b2b40440365fcce22ac32c0ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e408a05c641aa384fdd51f7b10cfda.png)
①如图2,若点F(恰好在上),求证:
;
②如图3,若点F在的延长线上,
,
,直接写出
的长.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
垂直平分边
,交
于点E,
平分
的外角
,
,垂足为点G,
,垂足为点H.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.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/20a541b81584a032f571159ea152c85a.png)
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图1,在四边形
中,
,点E在
的延长线上,连接
.
(1)求证:
;
(2)如图2,
于点F,若
,连接
,求证:
;
(3)如图3,在(2)的条件下,连接
,若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81939c1f23fa5fb48a3a270bbf52d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/7e747890-7ac4-4285-997f-0c5c9a1749c8.png?resizew=384)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07feb02ac97f2d1e95e769cd0bca93c8.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9d0c688e55286443c9974797fc647f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8960b101d782229d453fc5d7e3f13415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206205efc40c49835066c76c8af10bac.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa07f20d3560ec3fcb058bdc9364f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次