如图,
是
的直径,
垂直于弦
于点E,且交
于点D,F是
延长线上一点,若
.
是
的一条切线;
(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/683c590673eece14fea3319c4fd5eb55.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abf2001b3aaf7d0a5b0413b2d3ce0e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd90bfa2987b84df430498021d5f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
更新时间:2023-01-27 09:33:24
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
经过原点且与两坐标轴分别交于点A和点B,点A的坐标为
.D是
在第一象限内的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/3c5c53bf-a184-458b-9cc8-d9cbdbb5d10c.png?resizew=123)
(1)求
的半径.
(2)求圆心C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27eab855eb506806cbbbac9dfa01ba9c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/3c5c53bf-a184-458b-9cc8-d9cbdbb5d10c.png?resizew=123)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
(2)求圆心C的坐标.
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【推荐2】已知四边形
内接于
,
为
的直径,E是
延长线上一点,连接
.
交
于点F,
,
,求
的大小;
(2)如图②,若
与
相切于点C,延长
交
于点P,
,
,求
的长度.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/98f1af1593fed79cea33da7a88cbab9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff17acbc427ea571ac196739a3bc156b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee518d931600058794503dbca6d714f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9155d10b5bba17511f7b06f4b2ba0e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233a7781591ebdf05c96b6b06e975c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-问答题
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(0.65)
【推荐1】如图,四边形
内接于
,
,点D在
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/8c257dcb-a788-48bf-bd6b-4fba56c745c5.png?resizew=281)
(1)如图①,若
,求
的大小;
(2)如图②,若
为
的直径,过点A作
的切线,交
的延长线于点E,求
的大小.
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/8c257dcb-a788-48bf-bd6b-4fba56c745c5.png?resizew=281)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acad5677daee06c387b013934e9f766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)如图②,若
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
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解答题-证明题
|
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【推荐2】证明圆周角定理:一条弧所对的圆周角等于它所对的圆心角的一半.(要求画图,写出已知、求证,并且证明)
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解答题-作图题
|
适中
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【推荐1】下面是小芸设计的“过圆外一点作已知圆的切线”的尺规作图过程.
已知:
及
外一点
;求作:过点
作
切线.
作法:①连接
,作
的垂直平分线
,交
于点
;
②以
为圆心,
长为半径作圆,交
于点
、
两点;
③作直线
、
,则
、
即为
的切线.
根据小芸设计的尺规作图过程:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/3d73cbfe-7f9b-499a-b9e2-d20dcb465ed3.png?resizew=143)
(1)用直尺和圆规,在图中补全图形(保留作图痕迹);
(2)证明:
为
的切线.
已知:
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
作法:①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
③作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
根据小芸设计的尺规作图过程:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/3d73cbfe-7f9b-499a-b9e2-d20dcb465ed3.png?resizew=143)
(1)用直尺和圆规,在图中补全图形(保留作图痕迹);
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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名校
解题方法
【推荐2】如图,点A是直线AM与⊙O的交点,点B在⊙O上,BD⊥AM垂足为D,BD与⊙O交于点C,OC平分∠AOB,∠B=60°.
(1)求证:AM是⊙O的切线;
(2)若DC=2,求图中阴影部分的面积.(结果保留π和根号)
(1)求证:AM是⊙O的切线;
(2)若DC=2,求图中阴影部分的面积.(结果保留π和根号)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/ea7341c9-00c0-46b6-b50c-5636dbf259b9.png?resizew=138)
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名校
【推荐1】如图,
是
的直径,C为
上一点,D为
外一点,连接
,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/0f76fbfe-ef72-49b2-bae8-a92730a4d8f6.png?resizew=147)
(1)证明:直线
为
的切线;
(2)射线
与射线
交于点E,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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc3df24f2a2e1bc2671c073428c234c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6e68bafc58b96684de2150c6e71e00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/0f76fbfe-ef72-49b2-bae8-a92730a4d8f6.png?resizew=147)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65919ca8c6d16a7552fe85fb3eed7c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】阅读下面材料,并解决问题.
小明遇到一个问题:如图1所示,
是
的角平分线,
,
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/20e80d6c-0f87-4f6d-854b-53c91f800087.png?resizew=301)
(1)以下是小明推理过程的一部分,请你帮他补充完整.
解:如图2,分别过点
,
作
的垂线,垂足分别为
,
,
∴
,
∵
是
的角平分线,
∴
,
∴
.
…
(2)参考小明的推理方法,解决以下问题:
如图3,在四边形
中,
,
,
,
平分
,
,
与
相交于点
.
①
=____________.
②求
的值.
小明遇到一个问题:如图1所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19a6aeeea5bd6e49c1eb86b7a22e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2abe5da7ee1a2ff3ca5dec7a2d04dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/20e80d6c-0f87-4f6d-854b-53c91f800087.png?resizew=301)
(1)以下是小明推理过程的一部分,请你帮他补充完整.
解:如图2,分别过点
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec51db5ca4dc9853830f2b49c5143b9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0691c8f8dfd56b54cc157f6d913d01f3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd2bcb9d671c68d15136d28f6fc6261.png)
…
(2)参考小明的推理方法,解决以下问题:
如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a60503a191b09e42bf4e13118a72e4df.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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