如图1,四边形ABCD内接于⊙O,AC为⊙O的直径,AC与BD交于点E,且AE=AB.
(1)DA=DB,求证:AB=CB;
(2)如图2,△ABC绕点C逆时针旋转30°得到△FGC,点A经过的路径为
,若AC=4,求图中阴影部分面积S;
(3)在(2)的条件下,连接FB,求证:FB为⊙O的切线.
(1)DA=DB,求证:AB=CB;
(2)如图2,△ABC绕点C逆时针旋转30°得到△FGC,点A经过的路径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c1c07115a06b6efc6f200d088b20fd.png)
(3)在(2)的条件下,连接FB,求证:FB为⊙O的切线.
![](https://img.xkw.com/dksih/QBM/2018/5/22/1950720762167296/2010048230539264/STEM/2da46a5a264341ae94ab3dcc0260a6e8.png?resizew=312)
更新时间:2018-08-14 07:16:30
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解答题-证明题
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【推荐1】在拓展课常上,共学小组的同学用两个完全相同 的长方形纸片展开探究活动,这两张长方形纸片的长为4,宽为2.
(1)小红将两个完全相同的长方形纸片
和
摆成图
的形状,点
与点
重合,边
与边
重合,边
,
在同一直线上,试探究
的形状,并说明理由.
【解决问题】
(2)如图2,在(1)的条件下,小明将长方形
绕点
顺时针转动
,边
与边
交于点
,连接
,若
时,求
的值.
【拓展研究】
(3)从图1开始,小亮将长方形
绕点
顺时针转动一周,若直线
与线
所成夹角为
时,请直接写出
的面积.
(1)小红将两个完全相同的长方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a33d27a9c655d01f606e9bce02b0a5.png)
【解决问题】
(2)如图2,在(1)的条件下,小明将长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b15d8aaf5307e6c3282bffafb4b84f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5783f404ef983f048e034a17db5fd814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
【拓展研究】
(3)从图1开始,小亮将长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35992b319d8c74435ee9f08d0b4b3f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128638e48e657f8347943f8aae79545a.png)
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名校
【推荐2】已知线段
,将
绕点
逆时针旋转
得到
,连接
,在线段
上取一点
,
连接
,将线段
绕点
逆时针旋转
得到
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/623ed0cc-7a8c-484a-b3e2-8727a7f14af9.png?resizew=314)
(1)如图1,当
时,连接
,求
度数;
(2)如图2,当
时,试探究线段
与
之间满足的数量关系,并说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d44c6222502af3ccc9cbc4ce7051e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/623ed0cc-7a8c-484a-b3e2-8727a7f14af9.png?resizew=314)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51af2577e349157f70effa2a074c9c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-证明题
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【推荐3】如图1,已知△ABC为等边三角形,点D,E分别在边AB、AC上, AD=AE ,连接DC,点M,P,N分别为DE,DC,BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8b790c10-3fe3-445f-9c22-811857e7347d.png?resizew=355)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/68836ba6-441e-46e5-a90e-3ddcc1f41d01.png?resizew=259)
(1)观察猜想
在图1中,线段PM与PN的数量关系是______,∠MPN的度数是______;
(2)探究证明
若△ABC为直角三角形, ∠BAC=90° , AB=AC ,点DE分别在边AB,AC上, AD=AE,把△ADE绕点A在平面内自由旋转,如图2.连接DC,点M,P,N分别为DE,DC,BC的中点.判断△PMN的形状,并说明理由;
(3)拓展延伸
若△ABC中∠BAC=120°, AB=AC=13,点D,E分别在边AB,AC上, AD=AE=5 ,连接DC,点M,P,N分别为DE,DC,BC的中点.把△ADE绕点A在平面内自由旋转,如图3.
①△PMN的是______三角形.
②若△PMN面积为S,直接利用①中的结论,求S的取值取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/8b790c10-3fe3-445f-9c22-811857e7347d.png?resizew=355)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/68836ba6-441e-46e5-a90e-3ddcc1f41d01.png?resizew=259)
(1)观察猜想
在图1中,线段PM与PN的数量关系是______,∠MPN的度数是______;
(2)探究证明
若△ABC为直角三角形, ∠BAC=90° , AB=AC ,点DE分别在边AB,AC上, AD=AE,把△ADE绕点A在平面内自由旋转,如图2.连接DC,点M,P,N分别为DE,DC,BC的中点.判断△PMN的形状,并说明理由;
(3)拓展延伸
若△ABC中∠BAC=120°, AB=AC=13,点D,E分别在边AB,AC上, AD=AE=5 ,连接DC,点M,P,N分别为DE,DC,BC的中点.把△ADE绕点A在平面内自由旋转,如图3.
①△PMN的是______三角形.
②若△PMN面积为S,直接利用①中的结论,求S的取值取值范围.
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解答题-问答题
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【推荐1】问题提出
![](https://img.xkw.com/dksih/QBM/2022/3/21/2940870913515520/2964214274326528/STEM/23e789cb-7dac-4379-8190-9a05b0e47085.png?resizew=372)
(1)如图①,在矩形ABCD中,∠ABC的平分线交AD于点E,连接CE,若AD=9,∠DCE=15°,求△BCE外接圆的半径长.
问题解决
(2)某社区准备设计一个矩形花园,如图②是花园的示意图,图中EF,EG,FG,FC是花园内四条小路,这四条小路将花园分成五个三角形区域,分别用来种植不同种类的花.根据设计要求,∠EGF=∠BCF,∠EFC=90°,DF:DC=1:2,AE=8米,该矩形花园面积是否存在最大值?若存在,请求出其最大面积:若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2940870913515520/2964214274326528/STEM/23e789cb-7dac-4379-8190-9a05b0e47085.png?resizew=372)
(1)如图①,在矩形ABCD中,∠ABC的平分线交AD于点E,连接CE,若AD=9,∠DCE=15°,求△BCE外接圆的半径长.
问题解决
(2)某社区准备设计一个矩形花园,如图②是花园的示意图,图中EF,EG,FG,FC是花园内四条小路,这四条小路将花园分成五个三角形区域,分别用来种植不同种类的花.根据设计要求,∠EGF=∠BCF,∠EFC=90°,DF:DC=1:2,AE=8米,该矩形花园面积是否存在最大值?若存在,请求出其最大面积:若不存在,请说明理由.
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【推荐2】如图,⊙O是Rt△ABC的外接圆,过点A作⊙O的切线交BC的延长线于点P,D是
上的任意一点,连接AD,已知∠ABC=30°.
(1)求证:AP=AB.
(2)填空:
①当∠CAD= 时,四边形AODC是菱形;
②当∠CAD= 时,四边形ABDC是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(1)求证:AP=AB.
(2)填空:
①当∠CAD= 时,四边形AODC是菱形;
②当∠CAD= 时,四边形ABDC是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/0096b8a3-5f73-4b12-8313-4f64c63e9bd5.png?resizew=229)
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