如图是由边长为1的小正方形构成的网格,每个小正方形的顶点叫做格点.
ABC的顶点在格点上,仅用无刻度尺的直尺在给定网格中画图,画图过程用虚线表示,画图结果用实线表示,按步骤完成下列问题:
(1)在图1中,①过B作AC边上的高BH(H为垂足).②在AB边上找一点P,使tan∠ACP=
.
(2)在图2中,①在BC边上找一点D,使AD平分∠BAC.②AC边上找一点E,使DE∥AB.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)在图1中,①过B作AC边上的高BH(H为垂足).②在AB边上找一点P,使tan∠ACP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)在图2中,①在BC边上找一点D,使AD平分∠BAC.②AC边上找一点E,使DE∥AB.
更新时间:2021-04-17 12:54:14
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解答题-问答题
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【推荐1】如图,正方形网格中点A,B,C为三个格点(网格线的交点即为格点).
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897607517143040/2915312385777664/STEM/bc093d4e-7655-4a02-bb53-49ac0fa09021.png?resizew=209)
(1)根据以下要求画图
①画直线AB,画射线AC;
②在图中确定一个格点D,画直线CD,使得直线CD⊥AC,交AB于点E;
③过点B画直线
交线CD于点F;
(2)在第(1)小题中,与∠BAC相等的角有 个.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897607517143040/2915312385777664/STEM/bc093d4e-7655-4a02-bb53-49ac0fa09021.png?resizew=209)
(1)根据以下要求画图
①画直线AB,画射线AC;
②在图中确定一个格点D,画直线CD,使得直线CD⊥AC,交AB于点E;
③过点B画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd957aa8223dd9d0cd14668270cb68f9.png)
(2)在第(1)小题中,与∠BAC相等的角有 个.
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【推荐2】如图,直线
与直线
相交与点O,直线外有一点P.
(1)过点P画
,交
于点M,过点P画
,垂足为N;
(2)若
、求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)过点P画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3322db904c87b09f96b7b5d496a93ee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd378d3805a3d8295aec88bf3684f67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48dc758999a32eb7eea793fabc19758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588abe296d53dbbce91d0c693322bf8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/6/7a02dc24-d3d5-4978-9d81-f7dbe12318e9.png?resizew=166)
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解答题-证明题
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【推荐1】教材呈现:如图是华师版八年级上册数学教材第96页的部分内容.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896280992792576/2960226879266816/STEM/afeb898f-b1e5-450d-b56e-0e32791f15e3.png?resizew=654)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896280992792576/2960226879266816/STEM/f9911358-8c4f-4507-b197-301929a6098e.png?resizew=325)
请根据教材中的分析,
(1)结合图①,写出“角平分线的性质定理”完整的证明过程.
(2)定理应用:如图②,点P是
的角平分线上一点,
,垂足为点D,且
,点M是射线
上一动点,求
的最小值.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896280992792576/2960226879266816/STEM/afeb898f-b1e5-450d-b56e-0e32791f15e3.png?resizew=654)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2896280992792576/2960226879266816/STEM/f9911358-8c4f-4507-b197-301929a6098e.png?resizew=325)
请根据教材中的分析,
(1)结合图①,写出“角平分线的性质定理”完整的证明过程.
(2)定理应用:如图②,点P是
![](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/7e0f73b3c63084d9c032802e01f9a168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
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【推荐2】如图,OC平分∠AOB,CD⊥OA,交OA于点D,CE⊥OB,交OB于点E,M,N分别在OA,OB上,且OM=ON.
![](https://img.xkw.com/dksih/QBM/2020/1/14/2376689577893888/2377416052514816/STEM/dd8baa9ad9084b449901ccff7528bb26.png?resizew=172)
求证:△CDM≌△CEN.
![](https://img.xkw.com/dksih/QBM/2020/1/14/2376689577893888/2377416052514816/STEM/dd8baa9ad9084b449901ccff7528bb26.png?resizew=172)
求证:△CDM≌△CEN.
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解答题-作图题
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名校
解题方法
【推荐1】已知:如图所示△ABC.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898683856207872/2916753368137728/STEM/1941eccd-ab83-4204-ad88-438ec08aa6db.png?resizew=270)
(1)请在图中用无刻度的直尺和圆规作图:作∠BAC的平分线和BC的垂直平分线,它们的交点为D.(不写作法,保留作图痕迹)
(2)若AB=15,AC=9,过点D画DE⊥AB,则BE的长为 .
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898683856207872/2916753368137728/STEM/1941eccd-ab83-4204-ad88-438ec08aa6db.png?resizew=270)
(1)请在图中用无刻度的直尺和圆规作图:作∠BAC的平分线和BC的垂直平分线,它们的交点为D.(不写作法,保留作图痕迹)
(2)若AB=15,AC=9,过点D画DE⊥AB,则BE的长为 .
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【推荐2】学习了三角形的中位线定理后,小辉进行了拓展性研究.他发现.连接梯形两腰中点的线段也具有类似的性质.探究过程如下:
的垂直平分线,垂足为点
,连接
,连接
并延长交线段
的延长线于点
(只保留作图痕迹)
(2)已知:在四边形
中,
,
为
中点,
为
中点
猜想:
,且
.
证明:
是
中点,
①______
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7807a34780b91bf3ac4d00111d8cc30.png)
在
和
中
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74824e93f7d2b5151af6980fb7e762b.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f9f45313a1dcdd7c4cad707a54cb4c.png)
在
中,
是
中点,
是
中点
且③______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febb519970882f80d5cc3ef06ac98bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7f8609c55874d7c9a601a76a04e7a3.png)
请你根据该探究过程完成下面命题:
连接梯形两腰中点的线段平行于两底并且④______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)已知:在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9398fe7da3972063a4a3cae5f4e2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320b5dd8d2a9a98d052cdd1716c98e11.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd8d9924852c29f5ba10c20b74d6efc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6706c88443ead35c76bcf2f3ec24aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7807a34780b91bf3ac4d00111d8cc30.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cb357676994518e4c7e8caf85aa776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d266f64d5de4cc8a73e1aa4b72a9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74824e93f7d2b5151af6980fb7e762b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc128ce7ed788e42517ff53d9dc8ff32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f9f45313a1dcdd7c4cad707a54cb4c.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff70aa47645df75a3f184800a9e0290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febb519970882f80d5cc3ef06ac98bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7f8609c55874d7c9a601a76a04e7a3.png)
请你根据该探究过程完成下面命题:
连接梯形两腰中点的线段平行于两底并且④______.
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