名校
解题方法
1 . 如图1,
,
,
,
,四边形
均为平行四边形,且点
分别落在
上.
(1)若
的周长为16,用含
的代数式来表示
的面积
,并求出
的最大值;
(2)若四边形
均为矩形,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba15db0208ac46aa85dbc5a7a59e50cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c335ee45e5ac754bfa39d7e18d47c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec6bb6af96dffcef6e7508095e33518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f4022d33f2e35dbd9b36e712f00db0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273c094dcb5f4c8a4722533b0a6b7dc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68968a320a99e2f1a6532d5c6748ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75fdc8d9788cd3bc6970891743ada57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0be44077d42cfffece905b1af13e000.png)
![](https://img.xkw.com/dksih/QBM/2020/4/2/2439432685338624/2440122677796864/STEM/708b1a58-a8c1-4b5f-9b90-09ecd764b9d9.png)
您最近一年使用:0次
2020-04-12更新
|
410次组卷
|
3卷引用:2020年江苏省无锡市初中毕业升学预测考试02数学试题
解题方法
2 . 如图①,是一张直角三角形纸片,∠B=90°,AB=12,BC=8,小明想从中剪出一个以∠B为内角且面积最大的矩形,经过操作发现,当沿着中位线DE、EF剪下时,所得的矩形的面积最大.
(1)请通过计算说明小明的猜想是否正确;
(2)如图②,在△ABC中,BC=10,BC边上的高AD=10,矩形PQMN的顶点P、N分别在边AB、AC上,顶点Q、M在边BC上,求矩形PQMN面积的最大值;
(3)如图③,在五边形ABCDE中,AB=16,BC=20,AE=10,CD=8,∠A=∠B=∠C=90°.小明从中剪出了一个面积最大的矩形(∠B为所剪出矩形的内角),求该矩形的面积.
(1)请通过计算说明小明的猜想是否正确;
(2)如图②,在△ABC中,BC=10,BC边上的高AD=10,矩形PQMN的顶点P、N分别在边AB、AC上,顶点Q、M在边BC上,求矩形PQMN面积的最大值;
(3)如图③,在五边形ABCDE中,AB=16,BC=20,AE=10,CD=8,∠A=∠B=∠C=90°.小明从中剪出了一个面积最大的矩形(∠B为所剪出矩形的内角),求该矩形的面积.
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437998698872832/2438714906828800/STEM/61f5a5cd9bd9402b8b47473166a0c6e0.png?resizew=297)
您最近一年使用:0次
3 . 已知四边形
中,
,点
分别为
的中点,则四边形
的面积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90756f813ec5d4fc6e7054f6556143dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a337a934b801730321f67b0e5a0b144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
名校
4 . 已知:如图所示,在平面直角坐标系
中,四边形
是矩形,
,
,动点
从点
出发,沿射线
方向以每秒2个单位长度的速度运动;同时,动点
从点
出发,沿
轴正半轴方向以每秒1个单位长度的速度运动,设点
、点
的运动时间为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
(1)当
时,求经过点
,
,
三点的抛物线的解析式;
(2)当
时,求
的值;
(3)当线段
与线段
相交于点
,且
时,求
的值;
(4)连接
,当点
,
在运动过程中,记△
与矩形
重叠部分的面积为
,求
与
的函数关系式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b12eb17187b2bdb6246b477274e4b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10151385d21c8173c07e9d5cb23776d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6572528fbff2777e6f63b7b800515e.png)
(3)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c37d26e98d1acea56ccda551c1623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4afa84f553561b598228240957f0c51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/3/31/2431323033452544/2434480768819200/STEM/c383652468944adfbc772dbc0ce5fef9.png?resizew=157)
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16-17九年级·浙江杭州·
5 . 如图,在矩形
中,
为边
上一点,连结
,过点
作
于点
,连结
.
(1)求
的长;
(2)求
的面积.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27763f6dcbae61e12858d1893034164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cc087c22e1fc1197236c71e5465d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02629b64ac14b6d44402b8d13ee803e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/6b933243-6ddc-4f19-93fc-8cf8bad9cf3b.png?resizew=164)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b929a31d169a811004f0ecd6b7984e61.png)
您最近一年使用:0次
6 . 如图,
是矩形
内的任意一点,连接
、
、
、
, 得到
,
,
,
,设它们的面积分别是
,
,
,
, 给出如下结论:①
②
③若
,则
④若
,则
点在矩形的对角线上.其中正确的结论的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70b66073023aff920e047122b63e4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6aaf588fa1a15127568c78c39e8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a871db2bd253dec3d9e78fd567129a27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5659cf1e7b89090f313f735ef5b291d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a53c1ed888b57b17c2c44207a439ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315bb82e2dfa00423ca48635305e8203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad351432bd46e0fbeabf368e0ab55d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10195d68eb62e0fc5f7d6d0c83da44dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dd78e9156dcf6db93f6cbcc5b43b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.①② | B.②③ | C.③④ | D.②④ |
您最近一年使用:0次
2020-02-26更新
|
468次组卷
|
4卷引用:广西壮族自治区玉林市博白县2019-2020学年九年级上学期期末数学试题
7 . 如图,
中,
,
,
,将
绕顶点
逆时针旋转到
处,此时线段
与
的交点
恰好为
的中点,则
的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa61f314be58baeed41c498c876121d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45f12d765cbed18d0fd3d3aea2676cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd2981bf2261343f905ec1b5355a3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0556f4887074030608c7a5e0a49b605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fc6cf34323f80b94fe2a9d0867d62e.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d2237011f6fdb9ba01c237c71f3144.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/2fd9e8f8-80bc-4c2d-b19e-f148784aee9d.png?resizew=209)
您最近一年使用:0次
8 . 如图,在平面直角坐标系中,点
,
,且
,
满足
,点
为
上一个动点(不与
,
)重合),连接
.
图1 图2
(1)直接写出
___________,
___________;
(2)如图1,过点
作
的垂线交过点
平行于
轴的直线于点
,若点
,
求点
的坐标;
(3)如图2,以
为斜边在
右侧作等腰
,
.连接
,当点
从
向
运动过程中,
的面积是否发生变化,请判断并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48809df0583955a3bc5b415660ba761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/0203f033-c948-4450-9ba7-1a290e72c8df.png?resizew=294)
图1 图2
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)如图1,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b23b398f68667a8118d3bcf3dbcef7.png)
求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d12addf088e1d8cf453a5b383c0b3f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d6d2a0ac16b4df449826acdb490789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0574e32fad19571c0a9c9fcf839094ba.png)
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9 . 如图,用形状相同、大小不等的3块直角三角形木板,恰好能拼成如图所示的四边形
,如果
,
,那么这个四边形的面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068808d45ed3ac569ffaff7d8bde25ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/df199f98-befb-4598-9d16-d7ae8a0a24eb.png?resizew=268)
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10 . 如图:已知长方形ABCD的边AD长为a,边AB长为b,正方形CEFG的边长为c,点G在边CD上.
![](https://img.xkw.com/dksih/QBM/2019/12/8/2350575075237888/2350833942962176/STEM/c10f7f7075714dfd93accc8d5ab38407.png?resizew=181)
(1)求△BDG的面积;
(2)求△BDF的面积;
(3)以点G为圆心,以c的长度为半径画弧,求图中阴影部分的面积.(注:以上各题均用字母a、b、c表示.)
![](https://img.xkw.com/dksih/QBM/2019/12/8/2350575075237888/2350833942962176/STEM/c10f7f7075714dfd93accc8d5ab38407.png?resizew=181)
(1)求△BDG的面积;
(2)求△BDF的面积;
(3)以点G为圆心,以c的长度为半径画弧,求图中阴影部分的面积.(注:以上各题均用字母a、b、c表示.)
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