如图①,②,在平面直角坐标系xOy中,点A的坐标为(4,0),以点A为圆心,4为半径的圆与x轴交于O,B两点,OC为弦,∠AOC=60°,P是x轴上的一动点,连接CP.
(1)求∠OAC的度数;
(2)如图①,当CP与⊙A相切时,求PO的长;
(3)如图②,当点P在直径OB上时,CP的延长线与⊙A相交于点Q,问PO为何值时,△OCQ是等腰三角形?
(1)求∠OAC的度数;
(2)如图①,当CP与⊙A相切时,求PO的长;
(3)如图②,当点P在直径OB上时,CP的延长线与⊙A相交于点Q,问PO为何值时,△OCQ是等腰三角形?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/ab639a5b-ac5c-462d-a10c-75941e952b7f.png?resizew=689)
更新时间:2016-12-12 15:59:54
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解答题-问答题
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名校
【推荐1】如图
,在矩形
中,
,
,点
从
点出发,沿
路线运动,到
点停止;点
从
点出发,沿
运动,到
点停止.若点
、点
同时出发,点
的速度为每秒
,点
的速度为每秒
,
秒时点
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同时改变速度,点
的速度变为每秒
,点
的速度变为每秒
.如图
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出发
秒后
的面积
与
(秒)的函数关系图象;图
是点
出发
秒后
的面积
与
(秒)的函数关系图象.根据图象:
求
、
、
的值;
设点
出发
(秒)后离开点
的路程为
,请写出
与
的函数关系式,并求出点
与
相遇时
的值.
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解答题-作图题
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【推荐2】如图1,在正方形
中,
,动点P从点A出发,沿折线
运动,当点P到达点C时停止运动.连结
,若点P运动的路程为
,
的面积为y,当点P与点B重合时的值为0
(1)求y与x之间的函数解析式,并写出自变量x的取值范围;
(2)在图2的平面直角坐标系中画出这个函数的图象,并写出该函数图象的一条性质;
(3)根据图象,直接写出当
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(1)求y与x之间的函数解析式,并写出自变量x的取值范围;
(2)在图2的平面直角坐标系中画出这个函数的图象,并写出该函数图象的一条性质;
(3)根据图象,直接写出当
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解答题-问答题
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【推荐1】在
中,
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上一点,连接
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右侧作
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(1)求
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(2)求
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(1)求
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(2)求
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【推荐2】如图,已知在
中,点
,
分别是
,
上一点且
,点
,
分别是
,
的中点.过点
,
的直线分别交
,
于点
,
.求证:
.
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解答题-证明题
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【推荐1】在等边
中,点
是
上的动点,点
与点
、
不重合,点
在
的延长线上,且
.
是
的中点,求证:
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(2)如图2,若点
不是
的中点时,(1)中的结论“
”能否成立?若不成立,请直接写出
与
数量关系,若成立,请给予证明.
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(2)如图2,若点
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【推荐2】如图①,四边形
是正方形,
是等边三角形,M为对角线
(不含B点)上任意一点,将
绕点B逆时针旋转60°得到
,连接
.
是等边三角形吗?为什么?
(2)求证:
;
(3)①当M点在何处时,
的值最小;
②如图②,当M点在何处时,
的值最小,请你画出图形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349a15221bba2b20913b0a3ad4feeac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4be31ee6484dd926cecf19ead0e5a6d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823a10e2c6a485d5a0106f952c8360f7.png)
(3)①当M点在何处时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481b196bed2a1500dee6722f1525b158.png)
②如图②,当M点在何处时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f772ef87c3f046d458fd96cdf40cbc19.png)
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【推荐1】如图,Rt△ABC中,∠ABC=90°,以AB为直径的⊙O交AC于点D,E是BC的中点,连接DE、OE.
![](https://img.xkw.com/dksih/QBM/2013/5/5/1573648906764288/1573648912982016/STEM/326b8f8d6f304b67bd09e087d51ff7fa.png)
(1)判断DE与⊙O的位置关系并说明理由;
(2)若⊙O半径r=3,DE=4,求AD的长.
![](https://img.xkw.com/dksih/QBM/2013/5/5/1573648906764288/1573648912982016/STEM/326b8f8d6f304b67bd09e087d51ff7fa.png)
(1)判断DE与⊙O的位置关系并说明理由;
(2)若⊙O半径r=3,DE=4,求AD的长.
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【推荐2】如图1,在平面直角坐标系中,点M在x轴的正半轴上,⊙M交x轴 于A、B两点,交y轴C、D于两点,且C为弧AE的中点,AE交y轴于点G,若A点的坐标为(-2,0),CD=8
![](https://img.xkw.com/dksih/QBM/2015/1/20/1573788640051200/1573788645834752/STEM/0a9e175a68614a56bca052631ba617e3.png)
(1)求⊙M的半径
(2)求AE的长
(3)如图2,过点D作⊙M的切线,交x轴于点P.动点F在⊙M圆周上运动时,
的比值是否发生变化,若不变,求出比值:若不变,请说明变化规律
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(1)求⊙M的半径
(2)求AE的长
(3)如图2,过点D作⊙M的切线,交x轴于点P.动点F在⊙M圆周上运动时,
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