如图,
是
的直径,点
在
上,过点
的切线与
的延长线交于点
,且
.
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807394307596288/2810183588634624/STEM/6adf5f65abd74da4ac0778da68b3d458.png?resizew=223)
(1)求
的度数;
(2)若
的半径为3,求图中阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://img.xkw.com/dksih/QBM/2021/9/13/2807394307596288/2810183588634624/STEM/6adf5f65abd74da4ac0778da68b3d458.png?resizew=223)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
20-21九年级下·湖南长沙·阶段练习 查看更多[2]
湖南省长沙雅礼实验中学2020-2021学年九年级第二学期第一次阶段检测数学试卷(已下线)专题3.33 圆的综合题-圆与三角函数(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)
更新时间:2021-09-17 18:36:03
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】若一个三角形一条边的平方等于另两条边的乘积,我们把这个三角形叫做“比例三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/b68bb88b-b1b5-4917-8c26-aa7acbca4293.png?resizew=279)
(1)如图1,在四边形
中,
,对角线
平分
,
.求证:
是“比例三角形”;
(2)如图2,在(1)的条件下,当
时,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/b68bb88b-b1b5-4917-8c26-aa7acbca4293.png?resizew=279)
(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc9f0c725bab48110a5c55dba6af2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)如图2,在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c0fed1bec279a67db01c918711d4f5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,点D在⊙O的直径AB的延长线上,点C在⊙O上,AC=CD,∠ACD=120°.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/7d4c147a-1c58-4eca-a8a9-52e97886ad01.png?resizew=176)
(1)求证:CD是⊙O的切线;
(2)若⊙O的半径为4,求图中阴影部分(弧BC、线段BD及CD围成的图形)的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/7d4c147a-1c58-4eca-a8a9-52e97886ad01.png?resizew=176)
(1)求证:CD是⊙O的切线;
(2)若⊙O的半径为4,求图中阴影部分(弧BC、线段BD及CD围成的图形)的面积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】阅读与思考
学习了圆的相关知识后,某数学兴趣小组的同学们进行了如下探究活动,请仔细阅读,并完成相应任务.
任务:
(1)上述阅读材料中①处应填的内容是________,②处应填的内容是_______.
(2)兴趣小组的同学们继续思考,当直线AE与圆相切时,是否仍有类似的结论.请将下列已知、求证补充完整,并给出证明.
已知:如图,A是
外一点,过点A的直线交
于点B,C,__________.
求证:
___________.
学习了圆的相关知识后,某数学兴趣小组的同学们进行了如下探究活动,请仔细阅读,并完成相应任务.
割线定理 如图,A是![]() ![]() ![]() ![]()
![]() ∵ ![]() ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
(1)上述阅读材料中①处应填的内容是________,②处应填的内容是_______.
(2)兴趣小组的同学们继续思考,当直线AE与圆相切时,是否仍有类似的结论.请将下列已知、求证补充完整,并给出证明.
已知:如图,A是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15d1d216e47f797d0832ee80f50f01.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的直径,
是
上一点,过
作
的切线交
的延长线于点
,连接
、
,过
作
,交
于
,交
于
.
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234738835808256/3238146965225472/STEM/4b8ca28fef6646658bb59b4e59f8cc5c.png?resizew=184)
(1)求证:
;
(2)若
,
,求
、
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9916e0b16c34ef273cbc64c42dbba5ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/5/10/3234738835808256/3238146965225472/STEM/4b8ca28fef6646658bb59b4e59f8cc5c.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354430653efe54e3f3db09f705bc570c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d552f3ddc950356df2ee0a5ee2aecc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图1.在一平面内,从左到右,点A,D,O,C,B均在同一直线上.线段AB=20,线段CD=10,O是AB,CD的中点.固定点O以及线段AB,让线段CD绕点O顺时针旋转α(0°<α<180°).
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970509639933952/2972048847757312/STEM/70bd506b-7e00-4cc7-976b-276facae1872.png?resizew=429)
(1)连接AC,AD,BC,BD.
①求证:四边形ADBC为平行四边形;
②当α=90°时,求四边形ADBC的周长;
(2)连接AD.某个时刻,直线AD与线段OD旋转形成的扇形相切于点D,如图2所示,求此时线段OD扫过的扇形面积.
![](https://img.xkw.com/dksih/QBM/2022/5/2/2970509639933952/2972048847757312/STEM/70bd506b-7e00-4cc7-976b-276facae1872.png?resizew=429)
(1)连接AC,AD,BC,BD.
①求证:四边形ADBC为平行四边形;
②当α=90°时,求四边形ADBC的周长;
(2)连接AD.某个时刻,直线AD与线段OD旋转形成的扇形相切于点D,如图2所示,求此时线段OD扫过的扇形面积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
【推荐2】如图,在△ABC中,AB=AC,以AB为直径的⊙O分别交线段BC,AC于点D,E,过点D作DF⊥AC,垂足为F,线段FD,AB的延长线相交于点G.
(1)求证:DF是⊙O的切线;
(2)若CF=1,DF=
,求图中阴影部分的面积.
(1)求证:DF是⊙O的切线;
(2)若CF=1,DF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2016/10/14/1574248330756096/1574248337268736/STEM/5e77eb0f4e9b4fddaf3662b0c9205848.png?resizew=174)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,一个四边形材料
的一段
卡在模具中无法测量,
,
与
之间的距离为
,
,
,
,求
的长度.(参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84755b560534a4cab0c57e1a31cb656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b4db4adbae5ae1ff77670d0f2301c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3ab09cc1026bbd59993ce56f22ae73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf815426a7b443604b54cf3ed4002d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fe9cc87f8e8389c94efa7e7caab2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad548d3bb499aab6d0baf4032be99bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/b6fe15c8-ca68-4006-90b4-cd17d73aa959.png?resizew=217)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,圆O的直径
,
,点P是射线
上的一个动点
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/1b08bbc5-5788-48d8-a953-eefc19955d9b.png?resizew=281)
(1)如图1,求
的长;
(2)如图1,若
,连接
,求证:
为圆O的切线;
(3)如图2,连接
、点P在运动过程中,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddd8dba1965a735c24203e15f493b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/1b08bbc5-5788-48d8-a953-eefc19955d9b.png?resizew=281)
(1)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbda29fd703fd13e1bf4860d31cc5dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50bed8d6701c91027d598d92046962cc.png)
您最近一年使用:0次