如图,
为
的直径,弦
与
交于点E,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/fd369414-dec7-40d9-9f05-98464f0d465a.png?resizew=119)
(1)求
的度数;
(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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991d28fec5464134cececebc681e54ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4a288554fe25fe0a72530eb29756e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/fd369414-dec7-40d9-9f05-98464f0d465a.png?resizew=119)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2024-01-11 23:35:09
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【推荐2】(1)菱形有一个内角为
,一条较短的对角线长为
,则菱形的边长为_____;
(2)如图,在菱形
中,
,
,则
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
(2)如图,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/a90558c7-863e-42fa-b195-401a11a99c2f.png?resizew=156)
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【推荐1】如图,矩形
中,
,
,E是边
上的点,以
为直径的
恰好与
相切,切点为G.
![](https://img.xkw.com/dksih/QBM/2022/6/9/2997493053628416/2997500035932160/STEM/d23007f8-6dea-4406-9914-9334e6eeebae.png?resizew=231)
(1)求
的半径;
(2)延长
交
的延长线于点F,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/6/9/2997493053628416/2997500035932160/STEM/d23007f8-6dea-4406-9914-9334e6eeebae.png?resizew=231)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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解答题-作图题
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【推荐2】已知,如图,点A为⊙O上的一点
(1)用没有刻度的直尺和圆规作一个⊙O的内接正三角形ABC(保留作图痕迹并标出B、C);
(2)若⊙O半径为10,则三角形ABC的边长为
(1)用没有刻度的直尺和圆规作一个⊙O的内接正三角形ABC(保留作图痕迹并标出B、C);
(2)若⊙O半径为10,则三角形ABC的边长为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/4da30b77-5433-425f-af8d-3e2d0abf7aff.png?resizew=113)
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解答题-问答题
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【推荐1】如图,AB是
直径,
分别过
上点B,C的切线,且
,连接AC.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0eb0c11e4b7aa9030a6691aee35eed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c073d245848597fd44b5596685d5bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/31/2539603701579776/2539749965561857/STEM/bfcecc9009c44e0888e15dfcd936cb12.png?resizew=183)
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【推荐2】如图,在⊙O中,弦AB、CD相交于点E,∠BAC=40°,∠AED=100°,求∠ABD的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/cc96ca66-9b70-4744-bab2-daa9b5f9105f.png?resizew=127)
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解答题-作图题
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【推荐3】下面是小元设计的“过直线外一点作已知直线的平行线”的尺规作图过程.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492088525651968/2492336782376960/STEM/80dcbb88689149d693b17dfec51d4b1a.png?resizew=233)
已知:如图,直线l和直线外一点P.
求作:过点P作直线l的平行线.
作法:如图,
①在直线l上任取点O;
②作直线
;
③以点O为圆心
长为半径画圆,交直线
于点A,交直线l于点B;
④连接
,以点B为圆心,
长为半径画弧,交
于点C(点A与C不重合);
⑤作直线
.
则直线
即为所求.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492088525651968/2492336782376960/STEM/3b662dd2d0134902bc2d6efcd51acd5b.png?resizew=167)
根据小元设计的尺规作图过程,完成以下任务.
(1)补全图形;
(2)完成下面的证明:
证明:连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e3a46513292d14e2ac006a5b5c6b04.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd2b0b7448e976bb55b1f1550498bdc.png)
∴
_______
_________,
又∵
,
∴
_______
_________,
∴
,
∴
(___________________________)(填推理的依据).
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492088525651968/2492336782376960/STEM/80dcbb88689149d693b17dfec51d4b1a.png?resizew=233)
已知:如图,直线l和直线外一点P.
求作:过点P作直线l的平行线.
作法:如图,
①在直线l上任取点O;
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
③以点O为圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
⑤作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
则直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492088525651968/2492336782376960/STEM/3b662dd2d0134902bc2d6efcd51acd5b.png?resizew=167)
根据小元设计的尺规作图过程,完成以下任务.
(1)补全图形;
(2)完成下面的证明:
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e3a46513292d14e2ac006a5b5c6b04.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd2b0b7448e976bb55b1f1550498bdc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f617fa80f09fc245909492f5335ea5c.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585494b1fe389a1f0538980c06e26b2c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f617fa80f09fc245909492f5335ea5c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21efccda18dda51ffecfcf16dc77fb8b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20136a38098b6ee5abc40b57611b9dc.png)
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