如图,四边形
为
的内接四边形,
是
的直径,
,
.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b997b0da1c9338e640206bfc0d0a427a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460cf7177277714facb9949596142dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e0783d54-6980-4622-9def-88a75336d65d.png?resizew=144)
更新时间:2023-10-31 13:59:32
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,AB是⊙O的直径,AC是弦,OD⊥AB交AC于点D.若∠A=30°,OD=2.求CD的长.
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407538051883008/2408190626750464/STEM/c762c6f947514f159ce4254bbae12ce5.png?resizew=111)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图①,已知
的两条弦
,
相交于点M,
,设
的半径为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c3a9d1d2-9eba-4737-88d8-8a9814329315.png?resizew=302)
(1)求证:
;
(2)若
,
,求
的长;
(3)如图②,若
,
,设
,求证:
.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/c3a9d1d2-9eba-4737-88d8-8a9814329315.png?resizew=302)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44f15980e155bcc8a6de771e771c782.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e575a6c0f341094c18999472df34e568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7551011cfb75b26f35b07d6617c6a18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(3)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff49273b4e3185be3e6842b2c6e51931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc53e22a2b4390597e86f260da9e373a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6887e06e94e85d7714001d3ea12bb4fa.png)
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解答题-作图题
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适中
(0.65)
名校
【推荐1】(1)如图1,利用无刻度直尺和圆规,以
边上一点O为圆心,过A、D两点作
(不写作法,保留作图痕迹);
(2)如图2,
,
是
中的两条弦,C是
上一点,
,利用无刻度直尺在图中画一个含有
角的直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/f04c1460-e75c-4c40-a4c0-09baa4852f94.png?resizew=154)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456e0f77d83975fdbdb60b499cb5b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb94bd9eb80fb9f5f02f518bb8f2211.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/3839ac3b-feab-4401-a62f-febca47618c3.png?resizew=147)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在Rt△ABC中,∠A=90°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/f77b131c-1405-4df4-8885-985484deda53.png?resizew=189)
(1)求作Rt△ABC的外接圆⊙O;(要求:尺规作图,不写作法,保留作图痕迹)
(2)若∠C=30°,BC=10,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/f77b131c-1405-4df4-8885-985484deda53.png?resizew=189)
(1)求作Rt△ABC的外接圆⊙O;(要求:尺规作图,不写作法,保留作图痕迹)
(2)若∠C=30°,BC=10,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
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