1 . 如图,
是
的弦,直线
与
相切于点A,且
,点C为
上异于A,B的一点,则
的度数为___________ .
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af84da155bf0f02374cd70ea6eab796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
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2 . 如图,
是
的直径,点C,D,E在
上,若
,则
的度数是( )
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac94761bcaa599b6d25d95ad10e0dfd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-04-16更新
|
398次组卷
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3卷引用:2024年青海省果洛州久治县中考二模数学试题
3 . 在学习了《圆》以后,我们发现作辅助圆,利用圆的基本性质可以帮助我们解决一些求角度的问题.
例:如图①,在
中,
,
,点D是
外一点,且
.求
的度数.
(将下列解题过程补充完整)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/3ab2946e-daf2-4c52-ae4e-71039dffee4f.png?resizew=241)
(1)解:以点A为圆心,
长为半径作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
,
C,D两点都在
上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
______
(______)
【初步应用】
(2)如图②,在四边形
中,
,
,求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e764504f-d3ba-44fc-89d2-10a00256b8cb.png?resizew=142)
【方法迁移】
(3)如图③,已知线段
和直线l,在直线l上求作一点P,使
,用直尺和圆规在l上作出所有符合条件的点P.(不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e460fd99-7ab6-4380-b167-369cb59621c1.png?resizew=159)
图③
例:如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(将下列解题过程补充完整)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/3ab2946e-daf2-4c52-ae4e-71039dffee4f.png?resizew=241)
图①
(1)解:以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbf5d0c3be5a19a8eb8c57a98628a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891b97178165cc4e226c666477b93072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
【初步应用】
(2)如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efd5327b552638062f226ced0d0028e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e764504f-d3ba-44fc-89d2-10a00256b8cb.png?resizew=142)
图②
【方法迁移】
(3)如图③,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5479a3dc9e022f1c6aab7086852ab59.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/e460fd99-7ab6-4380-b167-369cb59621c1.png?resizew=159)
图③
您最近一年使用:0次
2024-01-23更新
|
50次组卷
|
2卷引用:青海省西宁市2023-2024学年九年级上学期期末数学试题
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4 . 如图.AB、BC为⊙O的两条弦,连接OA、OC,点D为AB的延长线上一点,若∠CBD=62°,则∠AOC的度数为( )
A.130° | B.124° | C.114° | D.100° |
您最近一年使用:0次
2022-03-22更新
|
392次组卷
|
8卷引用:2024年青海省玉树藏族自治州青海杂多县中考第三次模拟考试数学试题