如图所示,在△ABC中,BA=BC=20cm,AC=30cm,点P从A点出发,沿着AB以每秒4cm的速度向B点运动;同时点Q从C点出发,沿CA以每秒3cm的速度向A点运动,设运动时间为x秒.
(1)当x为何值时,PQ∥BC?
(2)当
时,求
的值;
(3)△APQ能否与△CQB相似?若能,求出时间x的值,若不能,说明理由.
(1)当x为何值时,PQ∥BC?
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066c4ab4086936130ad4f82d981af63c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4eb9569f564b97de74e97c0ae503dee.png)
(3)△APQ能否与△CQB相似?若能,求出时间x的值,若不能,说明理由.
![](https://img.xkw.com/dksih/QBM/2017/10/20/1799251796508672/1800194297888768/STEM/2a81a63f95174aaf9aae614b097f8855.png?resizew=211)
更新时间:2017-10-21 19:27:35
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【知识点】 相似三角形的判定与性质综合
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解答题-证明题
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较难
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【推荐1】已知:
,
,点
为动点,其中点
在射线
上(点
在点
的左侧),点
和点
分别在射线
的两侧,且
,
,
.
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(1)当
(如图1)求证:
;
(2)当点
与点
重合时(如图2),连接
,求
的长;
(3)连接
,当
是等腰三角形时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
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(1)当
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(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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解答题-证明题
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较难
(0.4)
名校
【推荐2】已知:如图,
中,
,
是
上一点,以点
为圆心,
为半径的圆切
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/21/3a289723-4032-46e6-8d2e-11f7bb686c97.png?resizew=156)
(1)求证:
;
(2)若
,
,求⊙O的半径;
(3)若点
关于
的对称点为
,试探究当点
满足什么条件时,四边形
为菱形.
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(1)求证:
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
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(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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