定义:如图①,
的半径为r,若点
在射线
上,且
,则称点
是点P关于
的“反演点”.
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669947702747136/2670165215879168/STEM/caf99a79b1a44958abce6c2ebc6656a8.png?resizew=555)
(1)如图①,设射线
与
交于点A,若点
是点P关于
的“反演点”,且
,求证:点
为线段
的一个黄金分割点;
(2)如图②,若点
是点P关于
的“反演点”,过点
作
,交
于点B,连接
,求证:
为
的切线;
(3)如图③,在
中,
,以
为直径作
,若点P为
边上一动点,点
是点P关于
的“反演点”,则在点P运动的过程中,线段
长度的取值范围是_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb7cd5cadb781688bb6defef1b3b0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669947702747136/2670165215879168/STEM/caf99a79b1a44958abce6c2ebc6656a8.png?resizew=555)
(1)如图①,设射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36db165843d0741424145ac634475f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fca904eaf822afe2de5c44fc03b2dbc.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f047e00bb23d8fa87651056ba4b2e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ff74733cd730d0e4e7a8355c090daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe29caf61254f41c49125e31bf37614.png)
20-21九年级上·江苏苏州·期末 查看更多[2]
更新时间:2021-03-03 22:47:56
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在矩形
中,
,点
为射线
上一点(点
不与点
重合),将
沿
折叠,得到
直线
与直线
交于点
.
与点
关于直线
对称时,若
,
①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b3c4b14a9eff7fdf670ecc16c52d88.png)
②求
的长.
(2)当点E在矩形
外时,若
如图2,当点
在线段
上时,求
的长.
(3)如图3,当点
在线段
的延长线上时,若(2)中其他条件不变,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f743f6ba8126c260063bf14983e74012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/732df52a7683fc142d89023ab192e8ac.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b3c4b14a9eff7fdf670ecc16c52d88.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)当点E在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a03cab5d4bc0b879d6bf06425ae87f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】在正方形
中,点
是
边上点,点
在
的延长线上,将线段
绕点
顺时针旋转
,到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/575b698d-7e79-4228-a47f-bb4bd71b1507.png?resizew=502)
(1)如图
,连接
,判断线段
与线段
的数量关系给出证明.
(2)如图
,若
正好经过点
.
①直接用等式表示线段
、
和
的数量关系为______.
②证明:
.
(3)如图
,当
经过点
时,若
,
,请直接写出此时正方形边的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/575b698d-7e79-4228-a47f-bb4bd71b1507.png?resizew=502)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
①直接用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a3dc3f3a02f4400e22dec2f2fee23.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60572975f9ac06ffc8d98ef94de49eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
真题
【推荐3】在平面直角坐标系x、y中,过原点O及点A(0,2)、C(6,0)作矩形OABC,∠AOC的平分线交AB于点D.点P从点O出发,以每秒
个单位长度的速度沿射线OD方向移动;同时点Q从点O出发,以每秒2个单位长度的速度沿x轴正方向移动.设移动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2013/7/24/1573671131586560/1573671137779712/STEM/8883097a701a4649ac646e16310d20d6.png)
(1)当点P移动到点D时,求出此时t的值;
(2)当t为何值时,△PQB为直角三角形;
(3)已知过O、P、Q三点的抛物线解析式为
(t>0).问是否存在某一时刻t,将△PQB绕某点旋转180°后,三个对应顶点恰好都落在上述抛物线上?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2013/7/24/1573671131586560/1573671137779712/STEM/8883097a701a4649ac646e16310d20d6.png)
(1)当点P移动到点D时,求出此时t的值;
(2)当t为何值时,△PQB为直角三角形;
(3)已知过O、P、Q三点的抛物线解析式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388d037fa2a2c7c54bdb5b5714293536.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】在
中,
,点
在
边上,且
.以
为斜边作
,使得
两点在直线
的异侧,且
与
交于点
.
;
(2)求证:
;
(3)过点
作
,垂足为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b391d070ba3bafe383e1cbd3f6be5687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef95ebb3e3e81f72c609203f0a046a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e3703bf787f6705fc045a8c626125b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd787b05a5ed78eed0a4e7354289b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f90eb172dbd2ff7ae6f705801c0737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ab7bc4a12d6884e26c617ce797f807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8b39cae844e8269ffd0c4b7b99db91.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee8395bbad7eb776f328d816b5abbb7.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ecae7eda53ecaec167fb38e0d9a17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113a991940b5ef0385b25e3a16218e0c.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知,如图
中,
是中线,点E是
上一点,
与
交于点F,
.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983294202798080/2988514911494144/STEM/f8c2cff0-b249-4c46-bb35-3c7456f11243.png?resizew=196)
(1)在图中与
相等的角有__________和__________;
(2)在图中找出与线段
相等的线段并证明;
(3)若
,且
,求
的值.(用含k的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3224eea0f01fdff8b9c258beffc50e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983294202798080/2988514911494144/STEM/f8c2cff0-b249-4c46-bb35-3c7456f11243.png?resizew=196)
(1)在图中与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
(2)在图中找出与线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f162db80bc14f3a155b9c7a6fa27c4d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dc54397517d4a4dd8e1e701d8a967c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6758420b503e09a38f7666876bd122c1.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,
是半圆
的直径,点
,
是半圆
上的点,且
,连结
交
于点
.
,求
的长.
(2)如图2,连接
,
,
,若
,求
的正弦值.
(3)如图3,连接
,作
交
于点
,连接
.求证:
.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/e8349ce3ea3c29b5d538830c8453cf91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fc28f622892dd18bbbac95d541acfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbc78baa4873ec664eb134dba380201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6086fe55ed3cbba4103b7e6879de0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20b215b33a861eeb653d35b2dd4dcef.png)
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【推荐2】如图①,正方形
中,
,点
是边
上的动点,点
是边
上的动点,且
,连接
.
(1)如图①,作
,交
于点
,连接
,求证;四边形
是平行四边形;
(2)如图②,延长.
、
相交于点
,试求
的度数;
(3)如图(3),连接
,记
,试求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c741cf8348e9fa4ee6894ac2c3ac6dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01f2b494eacc3965d82a5b1b0c4ee0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f87375324882d1cf468cddf0018e742.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/bdf8efed-23b4-4db8-bea1-6d007d438970.png?resizew=485)
(1)如图①,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26eee8e5abc45e39b2c79c027f87db8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59faf75f0c95312e556ae905b3ff5b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f690b762b0e0410d1757e620434f89be.png)
(2)如图②,延长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2b669a87f18866b2e9560f7fe1776d.png)
(3)如图(3),连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482a626ed93d0e534400625591e1d69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f840211177ac2434dd52b1e29d3cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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真题
【推荐1】如图,在△ABC中,∠BAC=90°,点E在BC边上,且CA=CE,过A,C,E三点的⊙O交AB于另一点F,作直径AD,连结DE并延长交AB于点G,连结CD,CF.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228340208361472/2229669366743040/STEM/759292f8f8f2474b99d12ca435ea32e3.png?resizew=161)
(1)求证:四边形DCFG是平行四边形;(2)当BE=4,CD=
AB时,求⊙O的直径长.
![](https://img.xkw.com/dksih/QBM/2019/6/18/2228340208361472/2229669366743040/STEM/759292f8f8f2474b99d12ca435ea32e3.png?resizew=161)
(1)求证:四边形DCFG是平行四边形;(2)当BE=4,CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee3c61d2298e75fc4f1643f8ebc2e4.png)
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【推荐2】已知,点I是△ABC的内心(三角形三个内角平分线的交点),过点B作BP⊥BI交AI的延长线于点P.
![](https://img.xkw.com/dksih/QBM/2015/11/12/1573926380494848/1573926385958912/STEM/a9f2e6d88cd047cbacd422c00045a910.png)
(1)如图1,若BA=BC,
①求证:BP∥AC;
②设∠BAC=α(其中α为常数),求∠BCP;
(2)如图2,CM、BN为△ABC的角平分线,若BM+CN=6,∠BAC=60°,请你直接写出点P到直线BC的距离的最大值等于___________.
![](https://img.xkw.com/dksih/QBM/2015/11/12/1573926380494848/1573926385958912/STEM/a9f2e6d88cd047cbacd422c00045a910.png)
(1)如图1,若BA=BC,
①求证:BP∥AC;
②设∠BAC=α(其中α为常数),求∠BCP;
(2)如图2,CM、BN为△ABC的角平分线,若BM+CN=6,∠BAC=60°,请你直接写出点P到直线BC的距离的最大值等于___________.
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