如图,在四边形ABCD中,AB
CD,∠BCD=90°,AB=AD=10cm,BC=8cm.点P从点A出发,以每秒3cm的速度沿线段AB方向向B运动,点Q从点D出发,以每秒2cm的速度沿线段DC方向向点C运动.已知动点P、Q同时发,当点Q运动到点C时,P、Q同时运动停止,设运动时间为t秒.
(1)求CD的长;
(2)当t为何值时,四边形PBQD为平行四边形?
(3)在运动过程中,是否存在四边形BCQP是矩形?若存在,请求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(1)求CD的长;
(2)当t为何值时,四边形PBQD为平行四边形?
(3)在运动过程中,是否存在四边形BCQP是矩形?若存在,请求出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/1f5954fc-8dd5-4847-82be-0845d60e407b.png?resizew=431)
更新时间:2021-08-25 16:56:33
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【推荐1】知识探究:
如图1是两直角边长分别为
,
的直角三角形,如果用四个与图1完全一样的直角三角形可以拼成如图2和图3的几何图形,其中图2和图3的四边形
、四边形
都是正方形、请你根据几何图形部分与整体的关系完成下列各题
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3fdd3f02-deb8-4609-99e9-51c0619ec5e8.png?resizew=437)
(1)请选择
,
,
中的有关代数式表示:
图2中正方形
的面积:___________.
图3中正方形
的面积:___________.
(2)请你根据题(1),写出下列三个代数式:
,
,
之间的等量关系___________.
知识应用:
(3)根据(2)题中的等量关系,解决如下问题:
①已知:
,
,求:
的值;
②已知:
,
,求:
的值.
如图1是两直角边长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff8245c281711ddde3aedd6a5eb76f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/3fdd3f02-deb8-4609-99e9-51c0619ec5e8.png?resizew=437)
(1)请选择
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137f29c5b5a406f663d6907ec7a0e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea5a2c4b069e2eb2e9b8baf8237f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
图2中正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
图3中正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)请你根据题(1),写出下列三个代数式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137f29c5b5a406f663d6907ec7a0e19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea5a2c4b069e2eb2e9b8baf8237f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
知识应用:
(3)根据(2)题中的等量关系,解决如下问题:
①已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26bd6e5455614942759d5354b0c9188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd4cd314bda2395e4dfdd6ca028d870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852e23a0022ffca4e65022de59697c15.png)
②已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0ed71bfcf26a071bab4d1d07963b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b52159c4f340e243c243988c9469106.png)
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【推荐2】如图,某大楼的顶部竖有一块宣传牌
.小明在山坡的坡脚
处测得宣传牌底部
的仰角为
,沿山坡向上走到
处测得宣传牌顶部
的仰角为
.已知山坡
的坡度
,
米,
米.
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(1)求点
距地面的高度;
(2)求大楼
的高度.(测角器的高度忽略不计,结果精确到0.1米.参考数据:
,
)
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(1)求点
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(2)求大楼
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【推荐1】如图,四边形ABCD为平行四边形,连接AC,且
.请用尺规完成基本作图:作出
的角平分线与BC交于点E.连接BD交AE于点F,交AC于点O,猜想线段BF和线段DF的数量关系,并证明你的猜想.(尺规作图保留作图痕迹,不写作法)
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【推荐2】如图,在平行四边形
中,
于点E,延长
至F点,使
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(1)求证:四边形
是矩形;
(2)若
,
,
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(1)求证:四边形
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(2)若
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解答题-作图题
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【推荐1】图①、图②均是
的正方形网格,每个小正方形的边长均为1,每个小正方形的顶点叫做格点,只用无刻度的直尺,在给定的网格中按要求画图,所画图形的顶点均在格点上,不要求写出画法,并保留作图痕迹.
(1)在图①中画一个面积为4的菱形,且邻边不垂直;
(2)在图②中画一个矩形,使其边都是无理数,且邻边不相等.
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(1)在图①中画一个面积为4的菱形,且邻边不垂直;
(2)在图②中画一个矩形,使其边都是无理数,且邻边不相等.
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【推荐2】在图①②中,点
在矩形
的边
上,且
,现要求仅用无刻度的直尺分别按下列要求画图.[保留画(作)图痕迹,不写画(作)法].
(1)在图①中,画
的平分线;
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(2)在图②中,画
的平分线.
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(1)在图①中,画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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(2)在图②中,画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f033eb202f5330181d2f5c33dbc6904.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/19e85867-a8ba-4d81-9da8-41a6a3c63ac7.png?resizew=196)
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【推荐1】如图,矩形
中,
,
.一动点P从B点出发沿对角线
方向以每秒2个单位长度的速度向点D匀速运动,同时另一动点Q从D点出发沿
方向以每秒1个单位长度的速度向点C匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点P、Q运动的时间为t秒
.过点P作
于点E,连接
,
.
;
(2)当t为何值时,
为直角三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07eabb3ff92cc5e071c48df759e64ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a46cf904f9d9a58de9f97c1144667a1.png)
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5845d0b7ca6980eea65473c0de995de.png)
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【推荐2】如图,矩形
中,
,
.一动点P从B点出发沿对角线
方向以每秒2个单位长度的速度向点D匀速运动,同时另一动点Q从D点出发沿
方向以每秒1个单位长度的速度向点C匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点P、Q运动的时间为t秒
.过点P作
于点E,连接
,
.
;
(2)四边形
能够成为菱形吗?如果能,求出相应的t值;如果不能,说明理由.
(3)当t为何值时,
为直角三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07eabb3ff92cc5e071c48df759e64ab8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a46cf904f9d9a58de9f97c1144667a1.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acf62f406a1ec6a6e17845cfc3c7558.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5845d0b7ca6980eea65473c0de995de.png)
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【推荐3】如图,在Rt△ABC中,∠C=90°,∠A=45°,AC=10cm,点D从点A出发沿AC方向以1cm/s的速度向点C匀速运动,同时点E从点B出发沿BA方向以
cm/s的速度向点A匀速运动,当其中一个点到达终点时,另一个点也随之停止运动,设点D,E运动的时间是t(0<1≤10)s.过点E作EF⊥BC于点F,连接DE,DE.
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296665117343744/2297561135202304/STEM/bbb229931cd74bdbb7404ec36f775a7e.png?resizew=286)
(1)用含t的式子填空:BE=________ cm ,CD=________ cm.
(2)试说明,无论t为何值,四边形ADEF都是平行四边形;
(3)当t为何值时,△DEF为直角三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2019/9/23/2296665117343744/2297561135202304/STEM/bbb229931cd74bdbb7404ec36f775a7e.png?resizew=286)
(1)用含t的式子填空:BE=________ cm ,CD=________ cm.
(2)试说明,无论t为何值,四边形ADEF都是平行四边形;
(3)当t为何值时,△DEF为直角三角形?请说明理由.
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