有这样一个问题:如图,在四边形ABCD中,AB=AD,CB=CD,我们把这种两组邻边分别相等的四边形叫做筝形.请探究筝形的性质.
小南根据学习平行四边形.菱形.矩形.正方形的经验,对筝形的性质进行了探究.
下面是小南的探究过程:
(1)根据筝形的定义,写出一种你学过的满足筝形的定义的四边形是______;
(2)由筝形的定义可知,筝形的边的性质是:筝形的两组邻边分别相等,关于筝形的角的性质,通过测量,折纸的方法,猜想:筝形有一组对角相等,请你帮小南说明理由;
已知:如图,在筝形ABCD中,AB=AD,CB=CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/ec7178e5-9d42-47f0-8562-108eb12c3f24.png?resizew=110)
求证:∠B=∠D.
证明:
(3)连接筝形的两条对角线,探究发现筝形的另一条性质:筝形的一条对角线平分另一条对角线.结合图形,请从边,角,对角线等方面写出筝形的其他性质(一条即可):____________.
小南根据学习平行四边形.菱形.矩形.正方形的经验,对筝形的性质进行了探究.
下面是小南的探究过程:
(1)根据筝形的定义,写出一种你学过的满足筝形的定义的四边形是______;
(2)由筝形的定义可知,筝形的边的性质是:筝形的两组邻边分别相等,关于筝形的角的性质,通过测量,折纸的方法,猜想:筝形有一组对角相等,请你帮小南说明理由;
已知:如图,在筝形ABCD中,AB=AD,CB=CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/ec7178e5-9d42-47f0-8562-108eb12c3f24.png?resizew=110)
求证:∠B=∠D.
证明:
(3)连接筝形的两条对角线,探究发现筝形的另一条性质:筝形的一条对角线平分另一条对角线.结合图形,请从边,角,对角线等方面写出筝形的其他性质(一条即可):____________.
更新时间:2022-09-23 18:13:33
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解答题-证明题
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【推荐2】如图,点A、B、C、D在同一条直线上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/c990297f-66ad-4068-a316-ec8e865ba028.png?resizew=149)
(1)求证:
;
(2)求证:
;
(3)若
是边
的中点,且
,将
向右平移,点
的对应点
与点
重合,则平移的距离为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c024852209aa85f06cf0ef757abf9b57.png)
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(1)求证:
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(2)求证:
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(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
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【推荐1】如图,某小区绿化带△ABC内部有两个喷水臂P、Q,现欲在△ABC内部建一个水泵O,使得水泵O到BA,BC的距离相等,且到两个嘈水管P、Q的距离也相等,请你在图中标出水泵O的位置(保留作图痕迹).
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【推荐2】如图1为放置在水平桌面上的台灯的平面示意图,灯臂AO长为50cm,与水平桌面所形成的夹角∠OAM为75°.由光源O射出的边缘光线OC,OB与水平桌面所形成的夹角∠OCA,∠OBA分别为90°和30°.(不考虑其他因素,结果精确到0.1cm. sin75°≈0.97,cos75°≈0.26,
≈1.73
(1)求该台灯照亮水平桌面的宽度BC.
(2)人在此台灯下看书,将其侧面抽象成如图2所示的几何图形,若书与水平桌面的夹角∠EFC为60°,书的长度EF为24cm,点P为眼睛所在位置,当点P在EF 的垂直平分线上,且到EF距离约为34cm(人的正确看书姿势是眼睛离书距离约1尺≈34cm)时,称点P为“最佳视点”.请通过计算说明最佳视点P在不在灯光照射范围内?
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(1)求该台灯照亮水平桌面的宽度BC.
(2)人在此台灯下看书,将其侧面抽象成如图2所示的几何图形,若书与水平桌面的夹角∠EFC为60°,书的长度EF为24cm,点P为眼睛所在位置,当点P在EF 的垂直平分线上,且到EF距离约为34cm(人的正确看书姿势是眼睛离书距离约1尺≈34cm)时,称点P为“最佳视点”.请通过计算说明最佳视点P在不在灯光照射范围内?
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【推荐1】将等腰三角形
折叠,使顶点
与底边
的中点
重合,折线分别交
、
于点
、
,连接
、
.
(1)如图1,求证:四边形
是菱形;
(2)如图2,延长
至点
,使
,连接
,并延长
交
的延长线于点
,在不添加任何辅助线的情况下,请直接写出图2中的所有平行四边形(不包括以
为一边的平行四边形)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(1)如图1,求证:四边形
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(2)如图2,延长
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解答题-作图题
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【推荐2】如图,正方形
的边长为
,点E在
上,
.正方形内存在匀强磁场,某种带电粒子以速度
(单位:
)沿着EF方向
从点E射入匀强磁场,在磁场中沿逆时针方向作匀速圆周运动,该圆与
相切,半径r(单位:m)与
满足关系
(k为常数).如图1,当
时,粒子恰好从点A处射出磁场.
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(1)①求常数k的值;
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或6,粒子在磁场中的运动时间分别为
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(2)如图2,若粒子从
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(1)①求常数k的值;
②若
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(3)该种粒子能否从边
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【推荐1】如图,
与
关于直线
对称,
与
的交点
在直线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/65baaf80-afae-4af3-b68f-eedd74ab06f9.png?resizew=170)
(1)指出
与
的对称点;
(2)指出
与
中相等的线段和角;
(3)在不添加字母和线段的情况下,图中还有能形成轴对称的三角形吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/65baaf80-afae-4af3-b68f-eedd74ab06f9.png?resizew=170)
(1)指出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)指出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)在不添加字母和线段的情况下,图中还有能形成轴对称的三角形吗?
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【推荐2】如图在
中,
,
,
为外角
平分线上一动点(不与点
重合),点
关于直线
的对称点为
,连接
,连接
并延长交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2019/10/18/2314444993478656/2315351671652352/STEM/e7da5973c5dc45dba3c5d7348b543d0b.png?resizew=223)
(1)求证:
;
(2)用等式表示线段
,
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2019/10/18/2314444993478656/2315351671652352/STEM/e7da5973c5dc45dba3c5d7348b543d0b.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
(2)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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