1 . 如图1,在
中,
,
,
,
,
分别为边
,
的中点,连接
,将
绕点
顺时针旋转.
时,设点
的初始位置为点
,连接
,
,试判断四边形
的形状,并说明理由;
(2)将
绕点
顺时针旋转一周的过程中.
①当点
落在边
上时,连接
,求
的值;
②当
时,连接
,求线段
的长;
(3)如图3,连接
,
交于点
,当线段
经过线段
的中点时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b266273d5284a9965f9ee5b48009f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cf2fa3cb87267ee5f968c2a9362d216.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f9215613b7b05217ed77268c238391.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531d6f90f144551a35d494b1fe7d2b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
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2 . 某数学小组的同学利用尺规完成“过直线外一点
作已知直线
的平行线”的作图,嘉嘉给出了如下作图过程,嘉嘉的作法中,可以直接判定两直线平行的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
A.同位角相等,两直线平行 | B.内错角相等,两直线平行 |
C.平行公理 | D.平行四边形的性质 |
您最近一年使用:0次
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3 . 在数学实践课上,老师提出如下问题:
已知:
,尺规作图:平行四边形
.
甲同学的主要作法如下:
①如图,作
,且点
与点
在
的异侧;
②在射线
上截取
,连接
.
关于上面内容,下列说法正确的是( )
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027ed57b9c6f24e27ec0ae282c76efa.png)
甲同学的主要作法如下:
①如图,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719f34ac90c66e24e4677d0a92261ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db79d15f26ceefe5cec31e3bfd94f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
关于上面内容,下列说法正确的是( )
A.甲同学的作法是错误的 |
B.甲同学作图的依据是“一组对边平行且相等的四边形是平行四边形” |
C.甲同学作图的依据是“两组对边分别平行的四边形是平行四边形” |
D.以上说法均错误 |
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4 . 综合实践课上,嘉嘉设计的“利用直角三角形作矩形”的尺规作图过程如下
根据嘉嘉尺规作图痕迹,完成下面的证明.
证明:
,
,
四边形
是平行四边形(①__________)(填推理依据).
又:
,
四边形
是矩形(②__________)(填推理依据).
①②应该填的内容分别是( )
分别以点![]() ![]() ![]() ![]() ![]() ![]() ![]() | 作射线![]() ![]() ![]() ![]() | 连接![]() ![]() |
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a01af7ec5a2bf06615df678cb85bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
又:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6808b55943e0ab815da922bf1b095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
①②应该填的内容分别是( )
A.有一个角是直角的平行四边形是矩形、对角线互相平分的四边形是平行四边形 |
B.对角线相等的平行四边形是矩形、对角线互相平分的四边形是平行四边形 |
C.对角线互相平分的四边形是平行四边形、对角线相等的平行四边形是矩形 |
D.对角线互相平分的四边形是平行四边形、有一个角是直角的平行四边形是矩形 |
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5 . 如图,在四边形
中,
,
平分
,
平分
,
,则四边形
的形状( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fe81d0b136fc2acc97ab50ffbf6edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.一定是平行四边形 | B.一定是矩形 | C.一定是菱形 | D.不确定 |
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6 . 如图,在矩形
中,动点
,
分别从点
,
同时出发,沿
,
向终点
,
移动.要使四边形
为平行四边形,甲、乙分别给出了一个条件,下列判断正确的是( )
甲:点
,
的运动速度相同;
乙:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
甲:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
乙:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
A.甲、乙都可行 | B.甲、乙都不可行 |
C.甲可行,乙不可行 | D.甲不可行,乙可行 |
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7 . 如图,在
的正方形网格中,以格点A,B,C,D,E,F中的四个点为顶点,可以画出平行四边形的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10daeb039eceebd957969565f35a997a.png)
A.三 | B.四 | C.六 | D.八 |
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8 . 如图,在四边形
中,
,
,
,
,E、F是
上的两动点,且
,点E从点B出发,当点F移动到点C时,两点停止运动.在四边形
形状的变化过程中,依次出现的特殊四边形是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613dedf2d90e58591b7ac4a250ac7b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
A.平行四边形→菱形→矩形→平行四边形 |
B.平行四边形→菱形→正方形→平行四边形 |
C.平行四边形→菱形→正方形→菱形 |
D.平行四边形→矩形→菱形→平行四边形 |
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9 . 在
中,
,要将该等腰三角形剪一刀后,再将两部分拼成一个平行四边形,现有图1和图2的两种方案,则正确的方案( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
甲:![]() ②将 ![]() ![]() ③将 ![]() ![]() | 乙:![]() ②将 ![]() ![]() ③将 ![]() ![]() |
A.只有甲方案是 | B.只有乙方案是 |
C.甲、乙两个方案都是 | D.甲、乙两个方案都不是 |
您最近一年使用:0次
10 . 要求只用圆规来验证纸片的两边是否平行,现有甲、乙两种方案如图1和图2.
对于两个方案,说法正确的是( )
甲 | 乙 |
|
|
①在纸片的一边上取线段![]() ②用圆规在另一边上截取 ![]() ![]() ③用圆规比较 ![]() ![]() ![]() ![]() | ①沿![]() ![]() ![]() ![]() ![]() ![]() ![]() ②用圆规比较 ![]() ![]() ![]() |
A.只有甲方案可行 | B.只有乙方案可行 |
C.甲、乙方案都可行 | D.甲、乙方案都不可行 |
您最近一年使用:0次