名校
1 . 如图,已知一个矩形纸片OACB,将该纸片放置在平面直角坐标系中,点A(10,0),点B(0,6),点P为BC边上的动点,将△OBP沿OP折叠得到△OPD,连接CD、AD.则下列结论中:①当∠BOP=45°时,四边形OBPD为正方形;②当∠BOP=30°时,△OAD的面积为15;③当P在运动过程中,CD的最小值为2
﹣6;④当OD⊥AD时,BP=2.其中结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcf43ba416adeb723cebe4aee6bbe34.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/8a319955-a3b4-411e-af9b-655ed54e63a5.png?resizew=160)
A.1个 | B.2个 | C.3个 | D.4个 |
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2020-06-26更新
|
1126次组卷
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14卷引用:2019年广东省深圳市大鹏新区中考数学二模试题
2019年广东省深圳市大鹏新区中考数学二模试题重庆市四区2019-2020学年八年级下学期期末数学试题浙江省宁波市慈溪市慈吉实验学校2021-2022学年八年级下学期期中数学试题(已下线)核心考点04特殊平行四边形-【满分全攻略】2022-2023学年八年级数学下学期核心考点+重难点讲练与测试(浙教版)(已下线)第5章 特殊平行四边形压轴(7个考点40题专练)-2023-2024学年八年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(浙教版)2022年广东省惠州市惠阳区中考数学一模试题(已下线)专题4.12 平面直角坐标系-折叠问题(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)广东省梅州市东山学校2021-2022学年 九年级上学期数学第三次月考试卷(已下线)专题18.2 特殊的平行四边形-【帮课堂】2022-2023学年八年级数学下册同步精品讲义(人教版)2023年广东省东莞市塘厦镇初级中学中考二模数学试卷(已下线)专题18.1 平行四边形 重难点题型12个-2022-2023学年八年级数学下册重难题型全归纳及技巧提升专项精练(人教版)(已下线)2023年深圳东莞二模(几何综合)辽宁省辽阳市第一中学协作体2023-2024学年九年级上学期第一次学情调研数学试题2024年广东省东莞市中考三模数学试题
2 . 如图,在矩形
中,
,一发光电子开始置于
边的点
处,并设定此时为发光电子第一次与矩形的边碰撞,将发光电子沿着
方向发射,碰撞到矩形的边时均反射,每次反射的反射角和入射角都等于
,当发光电子与矩形的边碰撞2020次后,它与
边的碰撞次数是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b890b0a3dc61b87a82e690903733a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490291012706304/2493021050945536/STEM/b9b1e337111d402c855fbe6ab5d046f7.png?resizew=132)
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3 . 如图1是一溜娃神器推车,溜娃时该推车底部支架张开后,其框架投影图如图2所示,两支撑轮是分别以点
,
为圆心,1.5分米长为半径的圆且与水平地面相切,其支架长
,竖直支撑柱
分米,水平座椅
分米,并与靠背
成
夹角,推手柄
分米.当张开角
时,
,
,
三点共线,且
,则
的长度为__________ 分米;如图3,当张开角
时,折叠支撑柱以上座椅部分绕着点
逆时针旋转使
点与圆心
重合,此时手柄
绕着点
顺时针旋转
至
处,则
到地面的距离是____________ 分米.
图1
图2
图3
![](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/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2222110ac5213ade4f5aae5436e475a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51faf5e3ee3aa6fa0831884abbd5f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8298dc11a937d0a6c2304f8508215c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea30b3a5f150793257ee373c4beafbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1595961d21adc2139887668fe92d2b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b763b6f4f86b652af33e33eeb6d91796.png)
图1
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490291937361920/2492949732081664/STEM/8b76cee4d27d49c4bb0e9ea91766efd6.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490291937361920/2492949732081664/STEM/f7844e0f593e41058e2b28526c5a4b50.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490291937361920/2492949732081664/STEM/c72f32b5b896464e94e0e36a2a2b0532.png?resizew=196)
您最近一年使用:0次
4 . 疫情期间部分学生选择在家用电视观看网络课程,为了保护眼睛,电视机的安装高度有一定的要求.如图所示,小嘉家的壁挂电视机的安装高度
为1米,电视的中心位置
(
的中点)比平视视线
低
(这样观看眼睛最不容易疲劳),电视机宽度
为
,眼到凳子平面的高度
为
.
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490334420369408/2492895379783680/STEM/98bb2cd9ce864410918d77ffd1804e36.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490334420369408/2492895379783680/STEM/0cd981b375cf4d088af57087f89c4ffb.png?resizew=234)
(1)求小嘉应选用凳子的高度;
(2)若看电视的视角
为
时,观看感最好,求此时凳子中心
到墙
的距离(电视机的厚度忽略不计).(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af62da2f87dfc02c63e7a1c0949f09d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a65d2df4dd0e311116956dfbdef521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7471d6fd2e6b878556e785f251306e5e.png)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490334420369408/2492895379783680/STEM/98bb2cd9ce864410918d77ffd1804e36.png?resizew=249)
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490334420369408/2492895379783680/STEM/0cd981b375cf4d088af57087f89c4ffb.png?resizew=234)
(1)求小嘉应选用凳子的高度;
(2)若看电视的视角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcae9d00980803e5955228d1e217abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654c79a470d5af5e0a34fd9233da5118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468bbbe89a7cacd23f90bc3e468b1ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaefffe1a6549aeba66a7724de7dce1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb5e558ea7c26efa256052a094e4288.png)
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5 . 如图,等腰直角三角形
,沿
剪去
,取
中点
,沿
剪去
,作
,沿
剪去
记
,五边形
的面积为
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e028be973d0fce777ff243ce72622faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da803a5e8ef81b68ddead39edf49e6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265b4a690ccd9f9a4fde375828a6ff6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99124df0dfdeabd56bd79228b668b403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c4750875c2116879747e9d35178db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3780ad386dcc121df985401438a823a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e66d69a422dd611c5fb3b18d4ccc835a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bb0bb1d59a0e0cf4e47c2036200afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcc5c5319f197967a6bc2ae4d49eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a781e6102c54f053b021d09bbe09771c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dabace330ccdd9755fbcf32d5d6343.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/fa7c92a1-6576-4952-8936-8f75cbbb22cf.png?resizew=162)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 如图,某兴趣小组用无人机进行航拍测高,无人机从1号楼和2号楼的地面正中间B点垂直起飞到高度为50米的A处,测得1号楼顶部E的俯角为60°,测得2号楼顶部F的俯角为45°.已知1号楼的高度为20米,2号楼的高度是多少米?(结果保留根号).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/c23c9d85-148e-4c28-9577-2f4e8be87395.png?resizew=281)
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解题方法
7 . 已知:如图1,六边形
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/9c9487ae-77b1-4174-b263-8298d1c79340.png?resizew=189)
(1)找出这个六边形中所有相等的内角_______.证明其中的一个结论.
(2)如果
,证明对角线
,
互相平分;
(3)如图,如果
,
,
,
,
,对角线
平分对角线
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680fb0a3f3cba59fc3092fb9b0a89008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/944d0397ac8fa28e487f429dc42efe60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c7fe25600cf4b66dcdd4ccefa834fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/4cd6de5d-a355-4cac-aded-b75f63aa09f0.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/2076c24e-7fe5-4135-b1bd-c7bd3c788bf1.png?resizew=186)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/9c9487ae-77b1-4174-b263-8298d1c79340.png?resizew=189)
(1)找出这个六边形中所有相等的内角_______.证明其中的一个结论.
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d623a68e1575896ff7d6e4d428256037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb388a36bd5caaa51b7e3c898e3c906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d63a0888e3e44fad7ef2bf5bbe7007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
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18-19九年级·浙江杭州·
8 . 如图,在直角梯形
中,
,
,点E,F分别为线段
的中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c323b048e046afc17e95dff9abd660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48925f9fba9ba1f5fca49a987d077192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f45c6b93a871dc4dd5e66a9bfdecd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/6/4/2477378686746624/2477422190649345/STEM/d77f13cf3cfa441aa0125ef023385f9f.png?resizew=175)
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名校
9 . 如图,小明家卫生间有一块直角梯形
地方(其中
),它恰好可以用四块相同型号的小直角梯形瓷砖无缝拼接而成,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e3c7dc81505f133ebf8a98d55b0114.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e3c7dc81505f133ebf8a98d55b0114.png)
![](https://img.xkw.com/dksih/QBM/2020/5/15/2463350681853952/2464212058914816/STEM/51556e2a89824f74946425e0c6b6a8d6.png?resizew=132)
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名校
10 . 如图,已知正方形ABCD的边长为4,E,F分别为AB,CD边上的点,且EF∥BC,G为EF上一点,且GF=1,M,N分别为GD,EC的中点,则MN=_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/c24667ca-3ebc-4e44-9287-53e4c3182dc1.png?resizew=153)
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2020-05-25更新
|
559次组卷
|
6卷引用:2020年浙江省慈溪市九年级学业水平模拟考试数学试题
2020年浙江省慈溪市九年级学业水平模拟考试数学试题(已下线)专题51 与四边形有关的填空题综合(九年级上重点突破)北师大版(已下线)浙江省温州市部分学校2022-2023学年九年级上学期数学期末试题变式题16-20(已下线)考点17 矩形、菱形、正方形(考点专练)-备战2021年中考数学考点微专题(已下线)考点19 图形的相似(考点专练)-备战2021年中考数学考点微专题河南省郑州市金水区实验中学2023-2024学年九年级上学期期末数学试题