如图,已知扇形
中,
,弦
,点
是弧
上任意一点(与端点
、
不重合),
于点
,以点
为圆心、
长为半径作
,分别过点
、
作
的切线,两切线相交于点
.
求弧
的长;
试判断
的大小是否随点
的运动而改变?若不变,请求出
的大小;若改变,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571f8dfb1eb003438f27bab2324140ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2998a2e3ad7b7abae08ff75a5ee265c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1680cbefbddcaa13b2e3df8eab7d383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e0ae133dcadbbe0532aa31e74e1fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3e298b2c864876f01b8674f5137484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5ea7b924505039af8a0a01aabe5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b664f3a011a2f1f31c66a2635c5367c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b664f3a011a2f1f31c66a2635c5367c.png)
![](https://img.xkw.com/dksih/QBM/2018/10/2/2045120028098560/2046892124520448/STEM/3cebeb8e4d2f4ea994fe01721db81857.png?resizew=134)
更新时间:2018-10-05 08:35:35
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】如图,已知⊙O,请用无刻度的直尺和圆规按要求画图(不写画法,保留作图痕迹).
(1)图1中,若点P为⊙O外一点,请过点P作⊙O的一条切线PM(点M为切点);
(2)图2中,若点Q为⊙O外一点,点C为优弧AB上一点,试确定点C,使得CQ平分∠ACB.
(1)图1中,若点P为⊙O外一点,请过点P作⊙O的一条切线PM(点M为切点);
(2)图2中,若点Q为⊙O外一点,点C为优弧AB上一点,试确定点C,使得CQ平分∠ACB.
![](https://img.xkw.com/dksih/QBM/2021/4/16/2701167531524096/2706199561445376/STEM/009bedb3-535c-437f-aa19-a6e6f677a906.png?resizew=399)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,以
为直径的⊙
交
于点
,交
于点
,过点
作
,且
.
(1)求证:
是⊙
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a763381e4a9e6ac9d9c1df51122570f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566acf647f9026e753c83b546fe3a147.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2021/9/23/2814369096794112/2815270602055680/STEM/5ba8dc32325c4fe185ea81b904ac3a24.png?resizew=127)
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,⊙
是
的内切圆,D,E,F为切点,且
,求
,
,
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc965c575bc199a559cb0a56a6a903d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】已知,
上有点A,B,连接
,
,
,
,C为
的中点,连接
.
的大小和
的长;
(2)如图②,延长
至点D,使得
,过点D作
的切线交
的延长线于点E,切点为F,连接
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c9743bea62bc0af19aab61e24d49ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c7120daf7c67145f765b3603e26164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
(2)如图②,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7678b8700039c4f984236fba95e743ea.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/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,四边形
中,连接
,
,以
为直径的
过点
,交
于点
,过点
作
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/fdb874c0-49ca-4902-8ec6-f77ca644da4b.png?resizew=159)
(1)求证:
是
的切线;
(2)若
,
,求
的长.(结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/fdb874c0-49ca-4902-8ec6-f77ca644da4b.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd81d9dd694008c999ed934645ad084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】【问题情境】
在综合实践活动课上,李老师让同桌两位同学用相同的两块含
的三角板开展数学探究活动,两块三角板分别记作
和
,
设
.
【操作探究】
和
的边
重合,再将
绕着点A按顺时针方向旋转
,旋转过程中
保持不动,连接
.
(1)当
时,
______;当
时,
°;
(2)当
时,画出图形,并求两块三角板重叠部分图形的面积;
(3)如图2,取
的中点F,将
绕着点A旋转一周,点F的动路径长为______.
在综合实践活动课上,李老师让同桌两位同学用相同的两块含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
【操作探究】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c3041fb97be89b77da7d9f08454c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d8e8ca9b631413f1d5a6ea3334d51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
(3)如图2,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c761e9e5a9ba76912e061686e633d0.png)
您最近一年使用:0次