如图,正方形网格中的每个小正方形的边长都是1,每个小正方形的顶点叫做格点,△ABC的三个顶点A,B,C都在格点上.
(1)画出△ABC绕点A逆时针旋转90°后得到的△AB1C1;
(2)求旋转过程中动点B所经过的路径长(结果保留π).
(1)画出△ABC绕点A逆时针旋转90°后得到的△AB1C1;
(2)求旋转过程中动点B所经过的路径长(结果保留π).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/18d00078-af96-4aa2-a741-c5c6f7c3316b.png?resizew=224)
更新时间:2018-08-06 09:38:18
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解答题-证明题
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解题方法
【推荐1】我们新定义一种三角形:若一个三角形中存在两边的平方差等于第三边上高的平方,则称这个三角形为勾股高三角形,这两边交点为勾股顶点.
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648597642600448/2649317788295168/STEM/6b7d3b48456f4dde91ac5eef25891b0d.png?resizew=259)
(1)特例感知
①等腰直角三角形_________勾股高三角形(请填写“是”或者“不是”);
②如图1,已知
为勾股高三角形,其中C为勾股顶点,
是
边上的高.若
,
,试求线段
的长度.
(2)深入探究
如图2,已知
为勾股高三角形,其中C为勾股顶点且
,
是
边上试探究线段
与
的数量关系,并给予证明;
![](https://img.xkw.com/dksih/QBM/2021/2/1/2648597642600448/2649317788295168/STEM/6b7d3b48456f4dde91ac5eef25891b0d.png?resizew=259)
(1)特例感知
①等腰直角三角形_________勾股高三角形(请填写“是”或者“不是”);
②如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af633abfe3cb03f1836db6c570a5bcc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)深入探究
如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594c9a8c6d789ada157beb3e6aeba799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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解答题-问答题
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【推荐2】在平静的湖面上,有一朵荷花高出水面半尺,忽然一阵强风吹来把荷花垂直拉到水里且荷花恰好落在水面,此时,捕鱼的人发现,花在水平方向上离开原来的位置2尺远,求湖水的深度.
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解答题-作图题
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【推荐1】如图,在边长为1个单位长度的小正方形组成的网格中,给出了格点△ABC(顶点是网格线的交点).
![](https://img.xkw.com/dksih/QBM/2015/1/20/1573788640051200/1573788645736448/STEM/0ed6cb0bd1044814982a8e5a803831ea.png)
(1)将△ABC绕着点B逆时针旋转90°,得到△A1BC1,请画出△A1BC1;求点A旋转过程中所经过的路径长.
(2)请画一个格点△A2B2C2,使△A2B2C2∽△ABC,且相似比不为1.
![](https://img.xkw.com/dksih/QBM/2015/1/20/1573788640051200/1573788645736448/STEM/0ed6cb0bd1044814982a8e5a803831ea.png)
(1)将△ABC绕着点B逆时针旋转90°,得到△A1BC1,请画出△A1BC1;求点A旋转过程中所经过的路径长.
(2)请画一个格点△A2B2C2,使△A2B2C2∽△ABC,且相似比不为1.
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解答题-问答题
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【推荐2】如图,在矩形
中,
,点E是
的中点.连接
,点P是
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/5c2bc2ed-0565-44de-9cdb-e00d1d1adc58.png?resizew=364)
(1)求
的长.
(2)当点P在
上时,连接
交
于点F,设
,
①用含x的代数表示
的长;
②若
平分四边形
的面积,求
的长.
(3)作
于点M,点P从点A开始出发,运动到点
,若
,请直接写出点M经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5538cbd9b97fab6401eb840b1af5708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/5c2bc2ed-0565-44de-9cdb-e00d1d1adc58.png?resizew=364)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)当点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1eddb789d57a9ad91615dfc673be391.png)
①用含x的代数表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63327d023e3b2ab9c03e63e6024d8d35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f8906c9d7ce68defb89848faa531ca.png)
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解答题-作图题
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【推荐1】如图是由小正方形组成的6×5的网格,每个小正方形的顶点叫做格点.点A、B,C,D 均在格点上,仅用无刻度的直尺在给定的网格中完成画图,画图过程用虚线表示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0880154e-7f6b-40e3-be09-55fa6add1a30.png?resizew=306)
(1)如图1,画出线段
绕点D顺时针旋转
得到的线段
,(点B的对应点为E,点C的对应点为F),再在
上找一点G,使
;
(2)如图2,在AC上找一点H,使
,再在
上找一点P,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0880154e-7f6b-40e3-be09-55fa6add1a30.png?resizew=306)
(1)如图1,画出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee662ef4fc90d0bbee6f1966722999d2.png)
(2)如图2,在AC上找一点H,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85e546e4bc04dcfb6d90fcda6440341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
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解答题-作图题
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【推荐2】(1)在方格纸中画出
绕点B顺时针方向旋转
后的
;
(2)已知点
,
,根据这两点建立平面直角坐标系,并写出点
的坐标和点C运动到点
经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cf39c4552ecb2b659f052dc5c0f5eb.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d861cf80bd971be02918cfa58cb76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/b6719518-1abf-4581-8788-6fedfa2c3bd7.png?resizew=181)
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