题型:解答题-问答题
难度:0.65
引用次数:665
题号:1179389
如图,在矩形ABCD中,AB=12cm,BC=6cm,点P沿AB边从点A开始向点B以2cm/s的速度移动,点Q沿DA边从点D开始向点A以1cm/s的速度移动,如果P、Q同时出发,用t(s)表示移动的时间(0≤t≤6),那么:
(1)当t为何值时,△QAP是等腰直角三角形?
(2)当t为何值时,以点Q、A、P为顶点的三角形与△ABC相似?
(1)当t为何值时,△QAP是等腰直角三角形?
(2)当t为何值时,以点Q、A、P为顶点的三角形与△ABC相似?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/86bb78dd-35d0-41b3-a8c5-b7d2dae22f49.png?resizew=197)
更新时间:2016-12-05 10:13:38
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【推荐1】如图,在△ABC中,AB=AC,D是AB上一点,过点D作DE⊥BC于点E,延长ED,交CA的延长线于点F.
(1)试判断△ADF的形状,并说明理由;
(2)若AF=BE=2,∠F=30° ,求△ABC的周长.
(1)试判断△ADF的形状,并说明理由;
(2)若AF=BE=2,∠F=30° ,求△ABC的周长.
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534969677971456/2541117430505472/STEM/f86faa97a86b490e93143efd7deaa5e3.png?resizew=96)
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【推荐2】如图,在
中,
,
,
,P是BC上一动点,过P作AP的垂线交CD于E,将
翻折得到
,延长FP交AB于H,连结AE,PE交AC于G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/386ef8cc-6d63-45be-bed0-c178e66cd1d9.png?resizew=301)
(1)求证
;
(2)当
时,求AE的长;
(3)当
时,求AG的长.
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(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4330d0c5de709eae0df72ec6dca7724.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefa2a38416cea94086912c4a4cc4887.png)
(3)当
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【推荐1】如图,已知△ABC是边长为6cm的等边三角形,动点P、Q同时从A、B两点出发,分别沿AB、BC匀速运动,其中点P运动的速度是1cm/s,点Q运动的速度是2cm/s,当点Q到达点C时,P、Q两点都停止运动,设运动时间为t(s),解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/9b7874f9-dc27-4a84-8181-35baa38175bc.png?resizew=128)
(1)当t=2时,判断△BPQ的形状,并说明理由;
(2)设△BPQ的面积为S(cm2),求S与t的函数关系式;
(3)作QR//BA交AC于点R,连结PR,当t为何值时,△APR∽△PRQ?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/9b7874f9-dc27-4a84-8181-35baa38175bc.png?resizew=128)
(1)当t=2时,判断△BPQ的形状,并说明理由;
(2)设△BPQ的面积为S(cm2),求S与t的函数关系式;
(3)作QR//BA交AC于点R,连结PR,当t为何值时,△APR∽△PRQ?
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名校
【推荐2】如图,在
中,
,
,动点
从点
开始沿
边以
的速度向点
运动;动点
从点
开始沿
边以
的速度向点
运动.点
和点
同时出发,当其中一个点到达终点时,另一点随之停止运动.设动点的运动时间为
,请问当
与
相似时,
的值是多少?
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