1 . 小泽和爸爸在护城河边散步,小泽打算让爸爸帮忙一起估算出护城河的宽度.他们按照以下方法进行测量:小泽在河边选取一点
,在河的对岸爸爸选取一个点
,测量得知
,小泽沿着河边继续向前走了
米到点
处,测得
,请你帮他们计算出护城河的宽度
.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ce06dbe9e1177468781ba4aff85ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/35a820cf-0e90-41a2-a48d-ef8fdb622738.png?resizew=170)
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2 . 下图是我国数学家赵爽在《周髀算经》中给出的图案,人们称它为“赵爽弦图”.图中四个全等的直角三角形可以围成一个大正方形,直角三角形两直角边长分别为
,斜边长为
,中间的部分是一个小正方形.若大正方形的面积是100,小正方形的面积是4,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852e23a0022ffca4e65022de59697c15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/9d5318ee-1c7e-4f89-b567-e4520b9619ba.png?resizew=136)
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3 . 如图,四边形
是果农王大爷家的果园平面图,王大爷准备沿
将果园分为
和
两个区域,分别种植两种不同的果树.经测量,
,
米,
米,
米,求
区域的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f8145e5b12aa0b0b13ce4d64c619ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a92a415bcc883894af9676ef063a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2beaf3846ecd4d1c6f9b4cf065cff09c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee07f879367bbac7c6dd72743aa30c2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/c3fb2826-affc-43b0-b440-a60312a87ace.png?resizew=119)
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4 . 已知在
中,
,
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796a8d24f65604f8dc731ffd8d9a4f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe44206a14fbc934ea6b6c6586329f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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5 . 如图,已知
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
________ °.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633bf2de732ae51fc06ef3d559915da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c46783b77cce2bd4b45b9acc61884.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/78967672-35ad-4c43-9546-d20d26ae9c5f.png?resizew=146)
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2023-08-14更新
|
42次组卷
|
2卷引用:陕西省安康市汉阴县2022-2023学年八年级下学期3月月考数学试题
6 . 如图,在平面直角坐标系中,已知点
,
,以点A为圆心,
长为半径画弧,交x轴的正半轴于点C,则C点的坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/5704424e-01c9-45f1-b38e-08f0abf4f31a.png?resizew=175)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93842cf36b1107534c3904d18ba3ae5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/5704424e-01c9-45f1-b38e-08f0abf4f31a.png?resizew=175)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 【定义新知】
如图1,将矩形纸片
沿BE折叠,点A的对称点F落在BC边上,再将纸片沿CE折叠,点D的对称点也与F重合,折叠后的两个三角形拼合成一个三角形(
),这个三角形称为叠合三角形.类似地,对多边形进行折叠,若折叠后的图形恰好可以拼合成一个无缝隙、无重叠的矩形,则这样的矩形称为叠合矩形.
(1)图1中叠合
的底边BC与高EF的长度之比为_______;
(2)将
纸片按图2中的方式折叠成一个叠合矩形
,若AD=13,MN=5,求叠合矩形
的面积;
【问题解决】
(3)已知四边形ABCD纸片是一个直角梯形,满足
,
,AB 点F为BC的中点,EF⊥BC,小明把该纸片折叠,得到叠合正方形.
①如图3,若线段EF是其中的一条折痕,请你在图中画出叠合正方形的示意图,并求出AB和CD的长;
②如图4,若线段EF是叠合正方形的其中一条对角线,请你在图中画出叠合正方形的示意图,并求出此时AB和CD的长.
如图1,将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(1)图1中叠合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
【问题解决】
(3)已知四边形ABCD纸片是一个直角梯形,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
①如图3,若线段EF是其中的一条折痕,请你在图中画出叠合正方形的示意图,并求出AB和CD的长;
②如图4,若线段EF是叠合正方形的其中一条对角线,请你在图中画出叠合正方形的示意图,并求出此时AB和CD的长.
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8 . 如图,一个正方形剪去四个角后形成一个边长为
的正八边形,则这个正方形的边长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/80388e63-f63c-4929-9142-8eb74e33e4ab.png?resizew=99)
您最近一年使用:0次
2023-07-27更新
|
103次组卷
|
3卷引用:2023年陕西省安康市汉阴县中考二模数学试题
9 . 如图,已知
的半径为
,则
的内接正方形
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/d8a3f3e0-f517-4344-a2b8-c21ff4510d7e.png?resizew=124)
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10 . 如图,
是
的直径,点C在半径
上,在
上取点D,使
,过点A作
的切线
交
的延长线于点E.
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/9b57d3d7-b8b2-4963-9955-eb7de44b4b8e.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c78f77e5b86ccd537e5f027de9ffe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a99a122b9db94f7d8ca1f51a6b297d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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