如图,已知⊙C过菱形ABCD的三个顶点B,A,D,连结BD,过点A作AE
BD交射线CB于点E.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746499391488/3058353038966784/STEM/65cac578d6df4c87a01ce849ef9eac15.png?resizew=226)
(1)求证:AE是⊙C的切线.
(2)若半径为2,求图中阴影部分的面积.
(3)在(2)的条件下,在⊙C上取点F,连结AF,使∠DAF=15°,求点F到直线AD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746499391488/3058353038966784/STEM/65cac578d6df4c87a01ce849ef9eac15.png?resizew=226)
(1)求证:AE是⊙C的切线.
(2)若半径为2,求图中阴影部分的面积.
(3)在(2)的条件下,在⊙C上取点F,连结AF,使∠DAF=15°,求点F到直线AD的距离.
更新时间:2022-09-03 09:38:05
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相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在菱形
中,
,
,点P为对角线
上任一点,过点P作
分别交
于点E、F,过点P作
分别交
于点
交于点Q,连接
.
;
(2)求证:
;
(3)选做题:若
,①沪科版:求
的长;②人教版:
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35a6773456765f939681c508a69e7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
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(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28df3a68a85c8db5a7d0bfbd942af14c.png)
(3)选做题:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764d93f8f349fe088b3a96a70a08c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
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【推荐2】已知在
中,
,点
为射线
上一动点
点
不与
,
重合
,连接
,以
为边作菱形
,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/77e0da52-d955-4949-b1b5-cc759b5aa155.png?resizew=540)
(1)尝试探究:
如图
,当点
在线段
上,
时,
与
的数量关系为______,
的度数为______;
(2)类比延伸
如图
,当点
在线段
的延长线上,
时,(1)中
与
之间的数量关系是否仍然成立?若成立,请证明,并求出
的度数
用含
的式子表示
;
(3)拓展应用
如图
,点
在线段
的延长线上,
,
,
,请求出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/77e0da52-d955-4949-b1b5-cc759b5aa155.png?resizew=540)
(1)尝试探究:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aae9a0c2f0f858b865485b1e099f9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840b694db3bf4f0cd1e6c6dba7f383e7.png)
(2)类比延伸
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e86d8bda46e4b59c2a5d640d1c8b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840b694db3bf4f0cd1e6c6dba7f383e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
(3)拓展应用
如图
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【推荐1】如图,△ABC中,E是AC上一点,且AE =AB,
,以AB为直径的⊙
交AC于点D,交EB于点F.
![](https://img.xkw.com/dksih/QBM/2015/5/27/1573843973750784/1573843980058624/STEM/98d6534c94cc48e493c4b39b53d4baee.png)
(1)求证:BC与⊙O相切;
(2)若AB=8,sin∠EBC=
,求AC的长.
![](https://img.xkw.com/dksih/QBM/2015/5/27/1573843973750784/1573843980058624/STEM/629daffe530043a9bc4273fec5f68779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2015/5/27/1573843973750784/1573843980058624/STEM/98d6534c94cc48e493c4b39b53d4baee.png)
(1)求证:BC与⊙O相切;
(2)若AB=8,sin∠EBC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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【推荐2】如图,AB是⊙O的直径,C是⊙O上一点,D是
的中点,E为OD延长线上一点,且∠CAE=2∠C,AC与BD交于点H,与OE交于点F.
(1)求证:AE是⊙O的切线;
(2)若DH=9,sinC=
,求直径AB的长.
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(1)求证:AE是⊙O的切线;
(2)若DH=9,sinC=
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【推荐1】滹沱河岸边盛开的粉黛乱子草吸引了很多市民前来观赏,如图1是其中一处美景的俯视图,漂亮的粉黛乱子草(扇形
中的阴影部分)花开灿烂,已知扇形半径
米,
米,点P为
的中点,
上有一座供游人休息的亭子(矩形
),点H,G分别在
上,
在
上.
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(1)求粉黛乱子草的种植面积;
(2)爱思考的嘉嘉想:“这个矩形亭子的占地面积能否再大一些呢?”请你通过计算回答嘉嘉的问题;
(3)在点P处垂直于地面向上竖着一根高为
米的柱子
,在A处安装有一个自动喷水装置.水流在各个方向上沿抛物线路径落下,喷出的水流在距离
的水平距离为
米时达到最高点.当喷头A旋转时,整个粉黛乱子草刚好都能被喷出的水流覆盖.建立如图2的坐标系,求出此坐标系中抛物线水流对应的函数关系式.
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(1)求粉黛乱子草的种植面积;
(2)爱思考的嘉嘉想:“这个矩形亭子的占地面积能否再大一些呢?”请你通过计算回答嘉嘉的问题;
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名校
【推荐2】如图,已知半圆O的直径AB=4,C为⊙O上的点,∠ABC的平分线交⊙O于点D,过点D作DE⊥BC交BC的延长线于点E,延长ED交BA延长线于点F.
(1)试判断EF与⊙O的位置关系,并说明理由;
(2)若
,求图中阴影部分的面积.
(1)试判断EF与⊙O的位置关系,并说明理由;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e060fccfa1726f7ac35f03637565be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/9e9847cb-5273-473e-aaa1-46bc31db8113.jpg?resizew=162)
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【推荐1】如图已知:
是圆
的直径,
,点
为圆
上异于点
、
的一点,点
为弦
的中点.
(1)如果
交
于点
,求
:
的值;
(2)如果
于点
,求
的正弦值;
(3)如果
,
为
上一动点,过
作
,交
于点
,与射线
交于圆内点
,请完成下列探究.
探究一:设
,
,求
关于
的函数解析式及其定义域.
探究二:如果点
在以
为圆心,
为半径的圆上,写出此时
的长度.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186354626d5a1d13b88dfb4df916947b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e8babee63bfc889ae5a34632284bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcdd8c05cd04f46c6f4ba8aa3cb1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2d1b8208a885e711ae113087cbc6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693063732b81f10ccc95f72106d60e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61588617d22abd00af4ca489bb3a8787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2dfc384f1a9b89cf0a436d1998d604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850f8372ededc0bbef29ed8383da9775.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5504d50bb557d1cf8b1a047ac1c99120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61588617d22abd00af4ca489bb3a8787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ba015fc9f3700a8c9ccc423cf1c97.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25de7178fc70cb4dbdc0c946d7d7464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e931b3cdabd578f00ce85275cd18f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693063732b81f10ccc95f72106d60e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4fd6998a8748375793cd1674f7417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
探究一:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d54d93a05999caa7777721d4a5b68f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5c0b5f073bcbe4113e04caaf9ad5ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0d46da745fa5e71ea97e7b30beb6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
探究二:如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190777397641216/2191635591364608/STEM/3f080457daf34bf2ba1cdc8cc8ad238e.png?resizew=476)
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解题方法
【推荐2】如图,直线
与
轴交于点
,与
轴交于点
,抛物线
过点
.
![](https://img.xkw.com/dksih/QBM/2020/7/5/2499461588664320/2500510687330304/STEM/5b738bf5-f939-4ffe-a58b-cc2e219a7c40.png?resizew=443)
(1)求出抛物线解析式的一般式;
(2)抛物线上的动点
在一次函数的图象下方,求
面积的最大值,并求出此时点
的坐标;
(3)若点
为
轴上任意一点,在(2)的结论下,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0422763a223a1a690c9c488f6b4076ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd91539551d6f675292df65a8f44aaa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2020/7/5/2499461588664320/2500510687330304/STEM/5b738bf5-f939-4ffe-a58b-cc2e219a7c40.png?resizew=443)
(1)求出抛物线解析式的一般式;
(2)抛物线上的动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8bf774ea5c9b87dc76962cb4bab147.png)
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