如图所示,以
的直角边
为直径作圆
,与斜边交于点
,
为
边上的中点,连接
.
(1)求证:
是
的切线;
(2)
连接
,
,当
为何值时,四边形
是平行四边形?并在此条件下求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)
![](https://img.xkw.com/dksih/QBM/2018/5/3/1937465066463232/1938323700203520/STEM/e33cc37819d04d4f9fe3a6cfe5a2c99f.png?resizew=3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c87ec29df8f8378b197102c50a6c0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94c754889aed0d95ee9aaef2c402e60.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/d24b18a1-6877-4a5a-8261-7e9160818027.png?resizew=106)
2018·四川广元·一模 查看更多[2]
更新时间:2018-05-04 23:12:34
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相似题推荐
解答题-应用题
|
较难
(0.4)
【推荐1】如图,小明家购买了一个直径
的圆形梳妆镜,其示意图如图1,点A,B是圆镜上两个挂绳固定点,点P是钉子悬挂点,挂绳长度为
,
,且
,挂绳可调节的范围为:
.
(1)小明通过调节挂绳长度,使得
与
相切于点A,求证:
与
相切;
(2)小明需要把镜子挂起来,经过对家人身高的调查,决定把镜子的中心(圆心O)定在距离桌面高度
处(点P,O,D三点共线,
交
于点C)如图2,且通过测量得到
,求点P到桌面的距离
的取值范围(结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9871f2a312aaf3a19b40e4fb1a7693b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc22cbc0aeb67c7869b87ed52f1955e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a606499df4459e5fbd6021c61a805359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c43f8d7f5f9b058b19c0f5a032f90016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/355b2a18-d1f2-4735-809d-619d73730b97.png?resizew=338)
(1)小明通过调节挂绳长度,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)小明需要把镜子挂起来,经过对家人身高的调查,决定把镜子的中心(圆心O)定在距离桌面高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f87842cb717bd7cf25c881d63e9e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f1898dde45eb453b6fcb63cf955e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,四边形ABCD内接于⊙O,BC为⊙O的直径,AC与BD交于点E,P为CB延长线上一点,连接PA,且∠PAB=∠ADB.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959243946442752/2965989509226496/STEM/833046c6-a8e2-41e6-bd65-1fffbdbfe81e.png?resizew=186)
(1)求证:PA为⊙O的切线;
(2)若AB=6,tan∠ADB=
,求PB的长;
(3)在(2)的条件下,若AD=CD,求△CDE的面积.
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959243946442752/2965989509226496/STEM/833046c6-a8e2-41e6-bd65-1fffbdbfe81e.png?resizew=186)
(1)求证:PA为⊙O的切线;
(2)若AB=6,tan∠ADB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(3)在(2)的条件下,若AD=CD,求△CDE的面积.
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解答题-证明题
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较难
(0.4)
解题方法
【推荐1】
内接于
,
,连接
;
![](https://img.xkw.com/dksih/QBM/2020/5/7/2464160985415680/2465223659339776/STEM/736b6ad1f65542669fad1a240bf2855b.png?resizew=587)
(1)如图1,连接
并延长交
于点
,连接
,求证:
;
(2)如图2,延长
交
于点H,点F为BH上一点,连接AF,若
,求证:
;
(3)在(2)的条件下,如图3,点E为AB上一点,点D为
上一点,连接
、
,若
,若
,
,
,连接
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://img.xkw.com/dksih/QBM/2020/5/7/2464160985415680/2465223659339776/STEM/736b6ad1f65542669fad1a240bf2855b.png?resizew=587)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df25964735534b5ebbb9430119d88e9.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bf43918cea3bcc42180d17da5de0c8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f17fa368eea29e3c2c2ced6a390562.png)
(3)在(2)的条件下,如图3,点E为AB上一点,点D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81bd61c94b4de7d9539dc6e5a727a00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7684e521519cc0f3cb1012fedb45d7d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99228f5bb6f829118d66c04ad5168d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4657d1abcf8efa5b2aff79be409857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-问答题
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较难
(0.4)
解题方法
【推荐2】如图,在平面直角坐标系中,直线
,与反比例函数
在第一象限内的图象相交于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719528078917632/2719543646052352/STEM/8abdaa2a502e4180a450cb7b207f2bf2.png?resizew=180)
(1)求该反比例函数的表达式;
(2)将直线
沿y轴向上平移,与反比例函数在第一象限内的图象相交于点B,与y轴交于点C,若
,连接
.请判断
与
的位置关系,并说明理由;
(3)在(2)的条件下,在射线
上是否存在一点P,使
与
相似,若存在,请直接写出P点坐标;不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d532ce76942846df88c6f66112e50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f0385a34634dc389c744bd5dfe2311.png)
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719528078917632/2719543646052352/STEM/8abdaa2a502e4180a450cb7b207f2bf2.png?resizew=180)
(1)求该反比例函数的表达式;
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d532ce76942846df88c6f66112e50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a97a38addd5c6f5b43155021d1cb4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355b74ba3dff8a70c29cfd51c00df29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(3)在(2)的条件下,在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e195f36d43128197ea62c7f53ed57197.png)
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