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:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/18d89963-d2de-40ee-95e9-6d378abf6b69.png?resizew=219)
(1)AC的长为 ;
(2)画△BAC的角平分线AD;
(3)E是AC与网格线的交点,画出点E关于AD的对称点F;
(4)P为AD上一动点,PE+PC的最小值为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/18d89963-d2de-40ee-95e9-6d378abf6b69.png?resizew=219)
(1)AC的长为 ;
(2)画△BAC的角平分线AD;
(3)E是AC与网格线的交点,画出点E关于AD的对称点F;
(4)P为AD上一动点,PE+PC的最小值为 .
更新时间:2022-04-22 23:53:23
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解答题-证明题
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【推荐1】如图,在△
中,
,
,
是
的角平分线,
是腰
边上的高,
和
相交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/9f151676-be97-4bfd-b1cc-330873295ce9.png?resizew=154)
(1)连结
,求
的度数;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/9f151676-be97-4bfd-b1cc-330873295ce9.png?resizew=154)
(1)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9dd24b906fc39a7a3259f5377cb8eef.png)
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【推荐2】定义:如果三角形有一边上的中线长恰好等于这边的长,那么称这个三角形为“奇异三角形”,这条中线为“奇异中线”.
(1)判断:命题“如果直角三角形是奇异三角形,那么奇异中线一定是较长直角边上的中线”是真命题还是假命题.
(2)如图,在
中,
,
,
,求证:
是“奇异三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/fe240732-9291-4fa8-8591-432c18d170f4.png?resizew=154)
(3)已知等腰
是“奇异三角形”,
,求底边
的长.
(1)判断:命题“如果直角三角形是奇异三角形,那么奇异中线一定是较长直角边上的中线”是真命题还是假命题.
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/fe240732-9291-4fa8-8591-432c18d170f4.png?resizew=154)
(3)已知等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0896521d46a6b47c995c58959bc1041b.png)
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【推荐1】如图,菱形
的对角线
,
相交于点O,过点D作
,且
,连接
.
(1)求证:四边形
为矩形;
(2)连接
,交
于点F,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6047a0228d514ad935f42f5bc881c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/7e34a83b-f10b-4350-9ddf-0660a7b06cf9.png?resizew=157)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ecc7afe00204e8a97c6b1241376119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】如图,在平行四边形
中,过点A作
垂直
,垂足为E,连接
,F为线段
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/50e25eb8-a13f-4b63-b8a1-16925dc0e001.png?resizew=199)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4908c742e58c66ed0feb53a29b0dc20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/50e25eb8-a13f-4b63-b8a1-16925dc0e001.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c85087a55a1fbbaa30f42d330402254.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e35afd6b684b9b64818b4d1c675262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
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名校
【推荐1】作图题
(1)填空:如果长方形的长为3,宽为2,那么对角线的长为______.
(2)如图,正方形网格中的每个小正方形边长都为1,每个小正方形的顶点叫格点,以格点为顶点(端点),分别按下列要求画图(不要求写画法和证明,但要标注顶点).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/cc16174b-8867-4ccc-8b20-1d8ec97d56d7.png?resizew=278)
①在图1中,画一个面积为4的菱形,且邻边不垂直.
②在图2中,画
,使
,且面积为6.
(1)填空:如果长方形的长为3,宽为2,那么对角线的长为______.
(2)如图,正方形网格中的每个小正方形边长都为1,每个小正方形的顶点叫格点,以格点为顶点(端点),分别按下列要求画图(不要求写画法和证明,但要标注顶点).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/cc16174b-8867-4ccc-8b20-1d8ec97d56d7.png?resizew=278)
①在图1中,画一个面积为4的菱形,且邻边不垂直.
②在图2中,画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
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解答题-作图题
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【推荐2】如图,方格纸中每个小正方形的边长均为1,
的顶点
、
、
和点
均在小正方形的顶点上.
(1)将
绕着点
逆时针旋转
得到
(点
、
对应点分别是点
、
),在图中画出
;
(2)在图中画出
,使点
在线段
的右侧,
,且
面积为4;
(3)连接
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/eb7e82a7-9170-4129-8850-12814c3dbb10.png?resizew=155)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c15514bc735fe4b744672edefe00009c.png)
(2)在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357c592ca5c0197172d9ae590014fb0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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解答题-问答题
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真题
【推荐1】如图,在平面直角坐标系xOy中,点A的坐标为(-2,0),等边三角形AOC经过平移或轴对称或旋转对称都可以得到△OBD.
(2)连接AD,交OC于点E,求∠AEO的度数.
(2)连接AD,交OC于点E,求∠AEO的度数.
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解答题-计算题
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【推荐2】阅读下面材料:
小伟遇到这样一个问题:如图1,在正三角形ABC内有一点P,且
,
,
,求∠APB的度数.
小伟是这样思考的:如图2,利用旋转和全等的知识构造
,连接
,得到两个特殊的三角形,从而将问题解决.参考小伟同学思考问题的方法,解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/a2cf2d39-73a4-40ce-a725-ab653310f605.png?resizew=438)
(1)请你计算图1中∠APB的度数.
(2)如图3,在正方形ABCD内有一点P,且
,
,
,求∠APB的度数.
小伟遇到这样一个问题:如图1,在正三角形ABC内有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
小伟是这样思考的:如图2,利用旋转和全等的知识构造
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d0f53af0839b0f803e470f0cf42c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/25/a2cf2d39-73a4-40ce-a725-ab653310f605.png?resizew=438)
(1)请你计算图1中∠APB的度数.
(2)如图3,在正方形ABCD内有一点P,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
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解答题-问答题
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【推荐3】(1)(操作发现)
如图1,在边长为1个单位长度的小正方形组成的网格中,△ABC的三个顶点均在格点上.请按要求画图:将△ABC绕点A按顺时针方向旋转90°,点B的对应点为B′,点C的对应点为C′,连接BB′,则∠AB′B= .
(2)(问题解决)
如图2,在等边三角形ABC内有一点P,且PA=2,PB=
,PC=1,求∠BPC的度数和等边三角形ABC的边长;
(3)(灵活运用)
如图3,在正方形ABCD内有一点P,且PA=
,BP=
,PC=1,求∠BPC的度数.
如图1,在边长为1个单位长度的小正方形组成的网格中,△ABC的三个顶点均在格点上.请按要求画图:将△ABC绕点A按顺时针方向旋转90°,点B的对应点为B′,点C的对应点为C′,连接BB′,则∠AB′B= .
(2)(问题解决)
如图2,在等边三角形ABC内有一点P,且PA=2,PB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)(灵活运用)
如图3,在正方形ABCD内有一点P,且PA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2019/3/7/2155520364290048/2156237320953856/STEM/4f9ed22d2ef543fabec69b1de34b47b7.png?resizew=424)
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