已知
是
的直径,弦
与
相交于点
,过点
作
的切线,与
的延长线交于点
,
.
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735568384/STEM/d75e6b5060924b0090d6e0295053958e.png?resizew=174)
(Ⅰ)如图①,连接
,若
为弧
的中点,求
的大小;
(Ⅱ)如图②,连接
,若
,求
的大小.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044602e61352c111931faa78f9d2bbd8.png)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735568384/STEM/323f2223bda6457a9e423b050470ee41.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735568384/STEM/d75e6b5060924b0090d6e0295053958e.png?resizew=174)
(Ⅰ)如图①,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c3cfc5aee07fef740703f904c3ff93.png)
(Ⅱ)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262a173a7cf68e06b4be175df69e2b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98f2e85bdf9c6669c14f8966ed53be.png)
更新时间:2019-03-29 11:52:04
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】如图,已知△ABC中,AB=AC=5,BC=3,∠A=20度,DE垂直平分AB,点D为垂足,交AC于点E,
(1)求△EBC的周长;
(2)求∠EBC的度数.
(1)求△EBC的周长;
(2)求∠EBC的度数.
![](https://img.xkw.com/dksih/QBM/2021/12/23/2878615049289728/2884252960931840/STEM/f9f2fe50-c1ce-4fb9-88f1-c043d1cd6a9c.png?resizew=116)
您最近一年使用:0次
解答题-作图题
|
较易
(0.85)
【推荐1】如图,在
上有三点A,
,
,
,请画出符合条件的角,并标注.
(1)在图①中画一个
的圆心角,标注为
;
(2)在图②中画一个
的圆周角,标注为
;
(3)在图③中画一个
的圆周角,标注为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/72ebf11c2d7466ef937bbff2899f5c86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/3c5ede0c-5a29-4182-a5e4-ee39f964b3c6.png?resizew=556)
(1)在图①中画一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c54e48d60446432de309432768c224b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)在图②中画一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5743813e7e57ab3316cde912116eef68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)在图③中画一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1de27e79e9a276238d608f828e31709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】如图,AB、AC为O的两条弦,延长CA到D,使AD=AB,如果∠ADB=35°,求∠BOC的度数
![](https://img.xkw.com/dksih/QBM/2020/11/17/2595073169752064/2595126629105664/STEM/def1e92dab8246b999b3938a2bcdd5bd.png?resizew=168)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知:如图,AM为⊙O的切线,A为切点,过⊙O上一点B作BD⊥AM于点D,BD交⊙O于C,OC平分∠AOB.
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911453608067072/2923283396182016/STEM/2659a831-46aa-43e0-a7fa-19f845b35f2c.png?resizew=238)
(1)求∠AOB的度数;
(2)若⊙O的半径为2cm,求∠ODB的正切值.
![](https://img.xkw.com/dksih/QBM/2022/2/7/2911453608067072/2923283396182016/STEM/2659a831-46aa-43e0-a7fa-19f845b35f2c.png?resizew=238)
(1)求∠AOB的度数;
(2)若⊙O的半径为2cm,求∠ODB的正切值.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】(1)
+![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/322d67d3e32c4dcfb423d6ff25ce2646.png?resizew=48)
(2)如图,P是⊙O外一点,OP垂直于弦AB于点C,交
于点D,连结OA、OB、AP、BP.根据以上条件,写出三个正确结论(OA=OB除外):
![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/95ec9f56e98b41cab1c23989fb080678.png?resizew=148)
① ②___;③.
![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/2110aa74b34c442ea85138b5e2ac3eca.png?resizew=212)
![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/322d67d3e32c4dcfb423d6ff25ce2646.png?resizew=48)
(2)如图,P是⊙O外一点,OP垂直于弦AB于点C,交
![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/209da912668e4d91afd94eeac8b2cda7.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2012/3/8/1573352753430528/1573352775008256/STEM/95ec9f56e98b41cab1c23989fb080678.png?resizew=148)
① ②___;③.
您最近一年使用:0次