在矩形
中,
,P是边
上一点,把
沿直线
折叠,顶点B的对应点是点G,过点B作
,垂足为E且在
上,
交
于点F.
(1)如图1,若点E是
的中点,
①求证:
;
②求
的长.
(2)如图2,连接
.
①求证:四边形
是菱形;
②当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d89ff9e8f94e5f3956ac0c9509e1888.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/85a12f03-3bec-4fb9-9b8b-d3692a5e27f0.png?resizew=307)
(1)如图1,若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0bc5dfb753d895113d01ac996748e9.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630fd67244cf5f0c436253295be6c4d0.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96676c2e675574274c57fab764b3a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
2023·广东惠州·二模 查看更多[3]
2023年广东省惠州市第五中学中考二模数学试卷(已下线)2023年广州等市二模(几何综合)(已下线)专题4.49 相似三角形折叠问题(分层练习)(综合练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)
更新时间:2023-05-20 22:03:24
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相似题推荐
解答题-问答题
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【推荐1】如图,在长方形ABCD中,AB=1,点E和点F分别为AD和CD的中点,沿BE将△ABE折叠,若点A恰好落在BF上,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/913e1aae-0306-4e26-bed8-b10bff6acc99.png?resizew=144)
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【推荐2】如图,把矩形纸片ABCD沿EF折叠,使点B落在边AD上的点B'处,点A落在点A'处.
(1)求证:B'E=BF;
(2)若AE=1,B'E=2,求梯形ABFE的面积.
(1)求证:B'E=BF;
(2)若AE=1,B'E=2,求梯形ABFE的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/8477a8be-57cf-4aa9-8e96-4b7ca4815070.png?resizew=149)
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解答题-作图题
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【推荐1】如图是一个
的网格图,每个小正方形的边长都为单位1,每一个小正方形的顶点叫做格点.图中已画出了线段
和线段
,其端点A,B,E,G均在小正方形的顶点上,点P是线段
上一非格点,请按要求画出图形(过程用虚线,结果为实线)并计算.
为边的正方形
;
(2)画一个以
为一条对角线的菱形
(点F在
的左侧),且
;
(3)在(1)正方形
的边
上画一点Q,使得
;
(4)在(1)中菱形
的边
上画一点M,使得经过点M的直线同时将菱形
和正方形
的面积二等分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a32408207f95ad69366d3375bc1c9d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)画一个以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13decabdb2fa45d1b1df357ec0ae26f8.png)
(3)在(1)正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1294b21ef6800dfdabe426d34e8b563.png)
(4)在(1)中菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解题方法
【推荐2】请阅读,完成证明和填空.
九年级数学兴趣小组在学校的“数学长廊”中兴奋地展示了他们小组探究发现的结果,内容如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/46a81b39-f374-4227-9a51-a4c18855ed20.png?resizew=554)
(1)如图1,正三角形
中,在
、
边上分别取点
、
,使
,连结
、
,发现
,且
.
请证明:
.
(2)如图2,正方形
中,在
、
边上分别取点
、
,使
,连结
、
,那么
______,且
______度.
(3)如图3,正五边形
中,在
、
边上分别取点
、
,使
,连结
、
,那么
______,且
______度.
(4)在正
边形中,对相邻的三边实施同样的操作过程,也会有类似的结论.
请大胆猜测,用一句话概括你的发现:________________________________.
九年级数学兴趣小组在学校的“数学长廊”中兴奋地展示了他们小组探究发现的结果,内容如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/46a81b39-f374-4227-9a51-a4c18855ed20.png?resizew=554)
(1)如图1,正三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/4c30fad9d4f86033bcd8375ddd6d3874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a7847bff0073127f10ec3925127414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6c179debfbc0301c7beb2310cd8c4a.png)
请证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6c179debfbc0301c7beb2310cd8c4a.png)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/29819c98ebd087116d5e579f4f088fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f69b26816ac72e2e2e7d9ea0578598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c088d0f9d1b04b32c4f363e114f235e.png)
(3)如图3,正五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/29819c98ebd087116d5e579f4f088fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f69b26816ac72e2e2e7d9ea0578598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e8d1fc1009670857b6c922fd5c66af.png)
(4)在正
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
请大胆猜测,用一句话概括你的发现:________________________________.
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解答题-证明题
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【推荐1】如图,已知△ABC内接于⊙O,AC是⊙O的直径,D是
的中点,过点D作直线BC的垂线,分别交CB、CA的延长线E、F
![](https://img.xkw.com/dksih/QBM/2013/5/16/1573651711795200/1573651717308416/STEM/4eaf095c1beb44188ce8237866d81cfb.png)
(1)求证:EF是⊙O的切线;
(2)若EF=12,EC=9,求⊙O的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c402fc152af7d1ec3025e41e670dd3.png)
![](https://img.xkw.com/dksih/QBM/2013/5/16/1573651711795200/1573651717308416/STEM/4eaf095c1beb44188ce8237866d81cfb.png)
(1)求证:EF是⊙O的切线;
(2)若EF=12,EC=9,求⊙O的半径.
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【推荐2】如图,在
中,直径
垂直于弦
,与
交于点E,过点A作
,过点D作
的垂线,垂足为F,交
的延长线于点P,连接
并延长交
于点G,连接
,已知
.
是
的切线;
(2)求证:
;
(3)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48319473c958114b0a37c1638bd4973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d18b61d83923f1ed1ca5cd775a3f75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24847adced410bd3e802d3e96ff5bf0.png)
(3)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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