如图是由小正方形组成的6×6网格,
的三个顶点A、B、C都在格点上.在给定的网格中,仅用无刻度的直尺,分别按下列要求画图,保留作图痕迹,不写画法.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/f144512b-e21d-4525-88c7-0b7fcb1385cc.png?resizew=731)
(1)在图1中作
的中线AD;
(2)在图2中作
的高线BE;
(3)在图3中AC边上确定点F,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/f144512b-e21d-4525-88c7-0b7fcb1385cc.png?resizew=731)
(1)在图1中作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在图2中作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在图3中AC边上确定点F,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d197ea8c1c8bbdf5edade431388eb713.png)
21-22九年级上·浙江金华·期末 查看更多[2]
更新时间:2022-08-01 14:34:57
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相似题推荐
解答题-作图题
|
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【推荐1】如图,在方格纸内将△ABC经过一次平移后得到△A′B′C′,图中标出了点B的对应点B′.利用网格点和直尺,完成下列各题:
(1)补全△A′B′C′;
(2)画出AB边上的中线CD;
(3)画出BC边上的高线AE;
(4)点Q为格点(点Q不与点B重合),且△ACQ的面积等于△ABC的面积,Q点有____个.
(1)补全△A′B′C′;
(2)画出AB边上的中线CD;
(3)画出BC边上的高线AE;
(4)点Q为格点(点Q不与点B重合),且△ACQ的面积等于△ABC的面积,Q点有____个.
![](https://img.xkw.com/dksih/QBM/2018/4/13/1923115435327488/1924468889452544/STEM/4c9060ab99dd4a2d8bff9c0d128bc254.png?resizew=232)
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【推荐2】如图,在一个
的正方形网格中,每个小正方形边长都为1个单位长,我们把顶点都在格点上的三角形称为格点三角形,图中的
就是一个格点三角形.请用无刻度直尺在网格中作图(保留作图痕迹);
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/e39ff95a-9d0a-49f5-9309-e0483f222d58.png?resizew=134)
(1)①作
边上的高
;
②在
边上找一点
,连
,使
和
的面积相等;
③作格点
(点
不与点
重合),使
和
的面积相等;
(2)图中与
全等的格点三角形(不包括
),可作出__________个(只填结果,不作图).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/e39ff95a-9d0a-49f5-9309-e0483f222d58.png?resizew=134)
(1)①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
③作格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)图中与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐3】(1)在正方形方格纸中,我们把顶点均在“格点”上的三角形称为“格点三角形”,如图△ABC是一个格点三角形,点A的坐标为(-2,2).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/2167a9fb-e85d-421c-b1b1-4c9d3499f902.png?resizew=228)
(1)点B的坐标为 ,△ABC的面积为 ;
(2)在所给的方格纸中,请你以原点O为位似中心,将△ABC缩小为原来的一半(仅用直尺);
(3)在(2)中,若P(a,b)为线段AC上的任一点,则缩小后点P的对应点P1的坐标为 .
(4)按要求作图,不要求写作法,但要保留作图痕迹.
我们知道,三角形具有性质:三边的垂直平分线相交于同一点,三条角平分线相交于一点,三条中线相交于一点,事实上,三角形还具有性质:三条高所在直线相交于一点.
请运用上述性质,只用直尺(不带刻度)作图.
①如图2,在平行四边形ABCD中,E为CD的中点,作BC的中点F.
②如图3,在由小正方形组成的4×3的网格中,△ABC的顶点都在小正方形的顶点上,作△ABC的高AH.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/2167a9fb-e85d-421c-b1b1-4c9d3499f902.png?resizew=228)
(1)点B的坐标为 ,△ABC的面积为 ;
(2)在所给的方格纸中,请你以原点O为位似中心,将△ABC缩小为原来的一半(仅用直尺);
(3)在(2)中,若P(a,b)为线段AC上的任一点,则缩小后点P的对应点P1的坐标为 .
(4)按要求作图,不要求写作法,但要保留作图痕迹.
我们知道,三角形具有性质:三边的垂直平分线相交于同一点,三条角平分线相交于一点,三条中线相交于一点,事实上,三角形还具有性质:三条高所在直线相交于一点.
请运用上述性质,只用直尺(不带刻度)作图.
①如图2,在平行四边形ABCD中,E为CD的中点,作BC的中点F.
②如图3,在由小正方形组成的4×3的网格中,△ABC的顶点都在小正方形的顶点上,作△ABC的高AH.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/22/e0d832d9-7423-4437-b1a4-ddec5b03169e.png?resizew=331)
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【推荐1】如图,在每个小正方形的边长为1的网格中,点A、B、C、D均在格点上,点P是直线CD上的点连BP,点A′是点A关于直线BP的对称点.
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795318534455296/2795401034121216/STEM/72c9ddb0-f38d-4874-859b-6d7e577b3fd5.png?resizew=469)
(1)在图①中,当DP=1(点P在点D的左侧)时,计算DA′的值;
(2)当DA′取值最小值时,请在如图②所示的网格中,用无刻度的直尺画出点A′,并简要说明点A′的位置如何找到的(不要求证明)
![](https://img.xkw.com/dksih/QBM/2021/8/27/2795318534455296/2795401034121216/STEM/72c9ddb0-f38d-4874-859b-6d7e577b3fd5.png?resizew=469)
(1)在图①中,当DP=1(点P在点D的左侧)时,计算DA′的值;
(2)当DA′取值最小值时,请在如图②所示的网格中,用无刻度的直尺画出点A′,并简要说明点A′的位置如何找到的(不要求证明)
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【推荐2】如图,在每个小正方形的边长为
的网格中,
的顶点A,
,
均在格点上,
点是线段
与网格线的交点,仅用无刻度的直尺完成下列作图.
(1)
的长度为______;
(2)在图
中,过
点作
交线段
于点
,画出线段
;作
点关于
的对称点
点,画出点
;
(3)在图
中,以A为中心,取旋转角等于
,把
逆时针旋转,画出旋转后的
.
与
对应
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/95be76e0-bf32-4f9a-be10-a81172892cea.png?resizew=461)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e295d8104c071f8833cfab408d592b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
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解答题-问答题
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【推荐1】综合与实践
问题情境:
数学活动课上,老师提出如下数学问题:如图1,将矩形纸片
以点C为中心顺时针方向旋转,当点A的对应点E落在
的延长线上时,求证
.
(1)请你解决老师提出的问题.
深入探究:
(2)“智慧小组”在解决老师提出的问题后,在图1的基础上又提出新的问题:如图2,过点F作
,垂足为M.过点G作
,垂足为N.试猜想线段
,
,
的数量关系,并说明理由.请你解决该问题.
(3)“创新小组”受到“智慧小组”的启发,在图2的基础上连接
,得到图3.并且提出:若
,
.求
的长.请你思考该问题,并直接写出结果.
问题情境:
数学活动课上,老师提出如下数学问题:如图1,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
(1)请你解决老师提出的问题.
深入探究:
(2)“智慧小组”在解决老师提出的问题后,在图1的基础上又提出新的问题:如图2,过点F作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d3d08ffb5bd4afdc6ea1c47855686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e3eda584bfbd67df9c0f0f056a4a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
(3)“创新小组”受到“智慧小组”的启发,在图2的基础上连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b1933a34ad9f9bd9a6e73961ab8756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf1834a4e7038d95b746f2c56d0fd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐2】如图1,已知矩形
中,
,O是矩形
的中心,过点O作
于E,作
于F,得矩形BEOF.
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101455445057536/3101678534098944/STEM/99ab6c9681c140ed97a635a13cd4759e.png?resizew=550)
(1)线段AE与CF的数量关系是 ,直线AE与CF的位置关系是 ;
(2)固定矩形
,将矩形
绕点B顺时针旋转到如图2的位置,连接
.那么(1)中的结论是否依然成立?请说明理由;
(3)若
,当矩形
旋转至点O在CF上时(如图3),设OE与BC交于点P,求PC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999d011e2b9684cf872414ad835039d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feacc4489396c7c13f2509fb20d2950b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c87ac3216588aa3b5c149701192697.png)
![](https://img.xkw.com/dksih/QBM/2022/11/3/3101455445057536/3101678534098944/STEM/99ab6c9681c140ed97a635a13cd4759e.png?resizew=550)
(1)线段AE与CF的数量关系是 ,直线AE与CF的位置关系是 ;
(2)固定矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b360d58bd43f72f5b887cf7055f73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59b8b689d2544f83601a655c3d24ab3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62676bcf5f9783c0457fce09fe561a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b360d58bd43f72f5b887cf7055f73b.png)
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【推荐1】如图,在由边长为1的小正方形组成的8×8的网格图中有两个格点
.(注:网格线交点称为格点)
(1)请直接写出
的长:______________;
(2)请在图中确定格点
,使得
的面积为10.如果符合题意的格点
不止一个,请分别用
,…表示;
(3)请用无刻度的直尺在图中以
为一边画一个面积为14的矩形
.(不要求写画法,但要保留画图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)请在图中确定格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e15e5cd03f0e1f601614397b0f9654.png)
(3)请用无刻度的直尺在图中以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190808325144576/2193759847677952/STEM/81547413db354dc795968865f0267a0c.png?resizew=481)
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【推荐2】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格点,仅用无刻度直尺,在给定网格
中画图,完成下列问题.
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629166460928/2502833686863872/STEM/52b68b79-fce5-4699-b769-6bb0cc52e693.png)
(1)过点
作直线
直线
;
(2)作线段
中点
;
(3)作点
关于直线
的对称点
;
(4)根据以上提示,点
、
、
分别为边
、
、
上的动点,当
的周长最小时,作出点
、
、
,并直接写出
的周长为____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95814ac824943302b8701ee0856f21eb.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629166460928/2502833686863872/STEM/52b68b79-fce5-4699-b769-6bb0cc52e693.png)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(3)作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
(4)根据以上提示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8de671dc938b237520a4b9b19f1217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8de671dc938b237520a4b9b19f1217.png)
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