如图(1)矩形
中,
,
,
,
将
绕点
从
处开始按顺时针方向旋转,
交
(或
)于点
,
交边
(或
)于点
,当
旋转至
处时,
的旋转随即停止.
过点
时,
也恰好过点
,此时,
__________
(填“
”或“∽”);
(2)类比探究:如图(3)在旋转过程中,
的值是否为定值?若是,请求出该定值;若不是,请说明理由;
(3)拓展延伸:设
,当
面积为4.2时,直接写出所对应的
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d10f2db7289ff1ec65c47d9af77a9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb4eb87fd9c474fea913e4b68818abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7465c3848d832ec772b6c1510d61aa59.png)
(2)类比探究:如图(3)在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4821eec9eb06107b9297db207544d62a.png)
(3)拓展延伸:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a387e25219d186235ae6ad0295a270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8a8f63088245653535d5d23d6f26a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2023-11-15 21:54:59
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】问题探究:
(1)如图1,已知线段AB=2,AC=4,连接BC,则三角形ABC面积最大值是 ;
(2)如图2,矩形ABCD,对角线AC、BD相交于点O,且AC+BD=16,求矩形ABCD面积最大值;
问题解决:
(3)如图3,在四边形ABCD中,AD∥BC,对角线AC、BD相交于点O,且∠AOB=120°.若AC+BD=10,则四边形ABCD的面积是否存在最大值?若存在,求出最大值;若不存在,请说明理由.
(1)如图1,已知线段AB=2,AC=4,连接BC,则三角形ABC面积最大值是 ;
(2)如图2,矩形ABCD,对角线AC、BD相交于点O,且AC+BD=16,求矩形ABCD面积最大值;
问题解决:
(3)如图3,在四边形ABCD中,AD∥BC,对角线AC、BD相交于点O,且∠AOB=120°.若AC+BD=10,则四边形ABCD的面积是否存在最大值?若存在,求出最大值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/30/2862350773370880/2866114106720256/STEM/d3f3b984-7a96-4c19-ad34-9c88b8e93e19.png?resizew=459)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图①,是某班放报纸的支架,图②为其示意图,其侧面垂直于地面的支架(含轮子)为AB,弯折的两条支架分别为AD,DC,且CD垂直地面于点C,经测量,
,
,
.
(1)求线段AB的长度;
(2)将图①的支架AB绕着点A按顺时针方向旋转
,且支架DC仍然垂直地面,得到图③,图④为其示意图,问AD从图②的位置到图④的位置这一过程中,绕着点A按逆时针方向旋转了多少度?
(结果精确到0.1;参考数据:
,
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84805ba1a35e973c2e2f2b5057fa2c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abe5510ae679507eeb526081ca7a5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ce84668823debb2c69d3147d6cea22.png)
(1)求线段AB的长度;
(2)将图①的支架AB绕着点A按顺时针方向旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
(结果精确到0.1;参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e15359371f06709efb628143fccf02f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55315e2bb934c29dda1a66c094617f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac980ce194582899d857b5f6edd431e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702e8d9602884d50948248734a1e1324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322990fcf7ead1531fe3af69fb7ed28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b86220aaf9fde46c79fd8b89222bf78.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/5b05222d-700d-499d-931c-3df50f127ae8.png?resizew=396)
您最近一年使用:0次
解答题-计算题
|
较难
(0.4)
解题方法
【推荐3】如图,A、B、C、D为矩形的四个顶点,AB=16cm,BC=6cm,动点P、Q分别从点A、C同时出发,点P以3cm/s的速度向点B移动,点Q以2cm/s的速度向点D移动.当点P运动到点B停止时,点Q也随之停止运动.
(1)问:运动______秒后,点P和点Q的距离是10cm.
(2)问几秒后,
是否存在以PD为腰的等腰三角形?若存在,求出t值;若不存在,说明理由;
(3)问多少秒后,以P、Q、D三点为顶点的三角形为直角三角形?请写出计算过程.
(1)问:运动______秒后,点P和点Q的距离是10cm.
(2)问几秒后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd3355d3bee7e168af3bec0662b7dd8.png)
(3)问多少秒后,以P、Q、D三点为顶点的三角形为直角三角形?请写出计算过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/166f51ba-5d18-42f0-ae55-692441ac5504.png?resizew=89)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】在正方形
中,对角线
与
交于点
;在
中,
.
与点
重合且
、
,分别交
、
于点
、
,请直接写出
与
的数量关系;
(2)将图1中的
绕点
顺时针旋转角度
).
①如图2,在旋转过程中(1)中的结论依然成立吗?请说明理由;
②如图2,当
时,连接
,若正方形的边长为2,请直接写出线段
的长;
(3)如图3,旋转后,若
的顶点
在线段
上移动(不与点
、
重合),当
时,猜想此时
与
的数量关系,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/7b7372d65c783ac6f4259dd44e2c9316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb4eb87fd9c474fea913e4b68818abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f22283744d2e7cc62bc6461ac92fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7372d65c783ac6f4259dd44e2c9316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d247d4819c9883f8daeeb92ad28f0c8.png)
①如图2,在旋转过程中(1)中的结论依然成立吗?请说明理由;
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f66df8f7e06da55ed8141c52c3601d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图3,旋转后,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7372d65c783ac6f4259dd44e2c9316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24fac194a8e19414b66cae95c8f1a110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】综合与探究
如图1,已知抛物线
与
轴交于点
,
,与
轴交于点
,点
是抛物线的顶点,点
是直线
上方抛物线上的一动点.
(1)求抛物线的顶点
的坐标和直线
的解析式;
(2)如图
,连接
交
于点
,若
,求此时点
的坐标;
(3)如图
,直线
与抛物线交于
,
两点,过顶点
作
轴,交直线
于点
.若点
是抛物线上一动点,试探究在直线
上是否存在一点
,使得以点
,
,
,
为顶点的四边形是平行四边形,若存在,请直接写出点
的坐标,若不存在,请说明理由.
如图1,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dd3220742a6a684c148b3d83ad9905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/c21cffa0-71b3-4e6d-a067-7c3390f6c763.png?resizew=254)
(1)求抛物线的顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1825181b6a58e46387c91bee2aa77b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07565f10847840e0fb07b05218ad17fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2672a1a92c09f2268628046bf6afbc01.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
您最近一年使用:0次