如图,在四边形ABCD中,AD
BC,∠B=90°,AD=9cm,BC=13cm.点P从点A出发,以1cm/s的速度向终点D运动;点Q从点C同时出发,以2cm/s的速度向终点B运动,当其中一个动点到达终点时,另一个点也随之停止运动.设运动时间为ts.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/ff40c692-392c-4e5a-9cdf-1a24e18f175c.png?resizew=220)
(1)若AB=3cm,求CD的长;
(2)当t为何值时,四边形PDCQ是平行四边形?
(3)探究:当线段AB的长为多少时,第(2)小题中的四边形PDCQ是菱形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/ff40c692-392c-4e5a-9cdf-1a24e18f175c.png?resizew=220)
(1)若AB=3cm,求CD的长;
(2)当t为何值时,四边形PDCQ是平行四边形?
(3)探究:当线段AB的长为多少时,第(2)小题中的四边形PDCQ是菱形?
21-22八年级下·贵州黔东南·期末 查看更多[3]
贵州省黔东南苗族侗族自治州三穗县三穗中学2021-2022学年八年级下学期期末数学试题(已下线)四边形的综合应用易错点1:动点问题找不到变量间的关系贵州省六盘水市云联学校2023-2024学年九年级上学期九月月考数学试题
更新时间:2022-10-08 16:36:15
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【推荐1】如图,将矩形ABCD沿对角线BD对折,点C落在E处,BE与AD相交于点F.若DE=4,BD=8.
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(1)求证:BF=DF;
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(1)求证:BF=DF;
(2)求△BDF的面积.
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【推荐2】如图,在中,
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(1)以点
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(2)求点
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【推荐1】如图,在△ABC中,∠ACB=90°,D是BC的中点,DE⊥BC,CE∥AD.若AC=2,CE=4;
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(2)求BC的长.
(1)求证:四边形ACED是平行四边形.
(2)求BC的长.
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【推荐2】如图,P是正
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(1)求证:四边形
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【推荐1】如图是由边长为1的小正方形组成的
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【推荐2】如图,已知矩形
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【推荐3】(1)如图1,点A和点B是直线
上两点,点C和点D是直线
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(2)如图2,在边长为4的菱形ABCD中,∠A=60°,M是边AD的中点,N是边AB上一动点,将△AMN沿直线MN翻折得到△PMN,求点P到直线BC的最小距离;
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【推荐1】如图,在平行四边形
中,
,
,
.若点E从点B出发以每秒1个单位长度的速度沿B—C—D向终点D运动,运动时间为t秒.过点E作点E所在的边(当点E与C重合时,点E所在边为
)的垂线,交四边形
其他的边于点F,在
的右侧作正方形
.
的长;
(2)当
时,求证:四边形
为平行四边形;
(3)当点E在边
上,且正方形
有且只有两个顶点位于四边形
的边上时,求t的取值范围;
(4)当四边形
为平行四边形时,直接写出
的长.
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【推荐2】如图,已知矩形
的两条对角线相交于点
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(1)判断四边形
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(2)若
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(1)判断四边形
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(2)若
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