如图,在中,
,用剪刀沿其
边上的中线
将
剪成两部分,将
沿
进行折叠,得到
,连接
交
于F点.
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945e93c9f3515ded840de09a9ba81ce8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f7f37289eeb9721a6f3cbfd0d7708a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c5c9cc1ed4bce98b7fae77e70b227f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
更新时间:2024-04-02 08:42:31
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解答题-问答题
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【推荐1】如图,将
绕着直角顶点
逆时针旋转
得到
,若
,
.求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29c57bc5109cd4388c667ad52a92056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/7de07b38-41b8-42b1-a505-52173a9d5cbb.png?resizew=144)
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【推荐2】如图,已知
、
分别是平行四边形
的边
、
上的高,对角线
、
相交于点
,且
.
是菱形;
(2)当
,
时,求
的余切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](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/03902478df1a55bc99703210bccab910.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37c9d3318008641685c92444e655e004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8832c5450a61500ccbf73d95e16f449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
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解答题-问答题
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【推荐1】如图,一架梯子
长
米,斜靠在墙上(墙与地面垂直),梯子底端至墙的距离
为
米.
距地面有多高?
(2)如果梯子的顶端下滑了
米,那么梯子的底端在水平方向滑动了几米?
(3)若梯子
的中点为
,梯子在下滑的过程中,
的长是否发生变化,如变化说明变化规律,如果不变直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98332ca603c91d0844ca2fb55763741b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)如果梯子的顶端下滑了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(3)若梯子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
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名校
【推荐2】如图,在
中,
是高,
是中线,点
是
的中点,
,垂足为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085cbdd37657b21dd1b686fc02d4f223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/76541b7e-f8de-4ca1-a2cf-15866510b0f8.png?resizew=170)
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解答题-证明题
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【推荐1】如图,Rt△ABC中,
,CD是斜边AB上的中线,分别过点A,C作
,
,两线交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/d0dea4bc-2efd-43a3-9ef8-17b32b494c7e.png?resizew=136)
(1)求证:四边形AECD是菱形;
(2)若∠B=45°,CD=2,求四边形AECD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3bcd66e0bc4c6d2eb2804635ae6ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/d0dea4bc-2efd-43a3-9ef8-17b32b494c7e.png?resizew=136)
(1)求证:四边形AECD是菱形;
(2)若∠B=45°,CD=2,求四边形AECD的面积.
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解答题-作图题
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【推荐2】如图,在平行四边形
中,按以下步骤作图:①分别以点B,D为圆心,以大于
的长为半径画弧,两弧分别交于E,F两点;②连接
,分别交
,
,于点M,N,连接
,
,求证四边形
是菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81613520ab5a478f0b2616a9bcb79d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408e2d26c0c8a6594c4baba496a4651d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/1063c3a2-25ab-45ba-aa0e-a39d885c74dd.png?resizew=126)
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【推荐1】如图①,将笔记本活页一角折过去,使角的顶点
落在
处,
为折痕.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/1a78b4d4-1e40-4fdb-a9b9-c836f773df88.png?resizew=335)
(1)图①中,若
,求
的度数;
(2)如果将图①的另一角
斜折过去,使
边与
重合,折痕为
,如图②所示,若
,求
以及
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/1a78b4d4-1e40-4fdb-a9b9-c836f773df88.png?resizew=335)
(1)图①中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ccc7d2f8af35a252977d6e2af4663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dcf7583c3635618b597871db818e64.png)
(2)如果将图①的另一角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dcf7583c3635618b597871db818e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ccc7d2f8af35a252977d6e2af4663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
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解答题-作图题
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【推荐2】如图1,在△ABC纸片中,∠ABC=90°,将该纸片折叠,使得点C的对应点P落在AB边上且OP⊥AB,折痕为OM.
(1)若BC=8,BP=4,求OP的长;
(2)请在图2中探究思考,能否用无刻度的直尺和圆规作出符合题意的折痕?(不需要写出作法,但要保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827743367815168/2828316188237824/STEM/b90c764a-f0d5-4d48-962a-491505b8c877.png)
(1)若BC=8,BP=4,求OP的长;
(2)请在图2中探究思考,能否用无刻度的直尺和圆规作出符合题意的折痕?(不需要写出作法,但要保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827743367815168/2828316188237824/STEM/b90c764a-f0d5-4d48-962a-491505b8c877.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827743367815168/2828316188237824/STEM/9afb28ed-6c1c-48ec-a30f-f62ddb4a7937.png)
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