已知:如图,点
和
.
求作:直线
,使得
与
相切于点
.
作法:(1)连接
,分别以点
和点
为圆心,大于
的长为半径作弧,两弧交于
两点;
(2)作直线
,交
于点
;
(3)以点
为圆心,以
长为半径作
,与
相交,其中一个交点为点
;
(4)作直线
.
直线
即为所求作.
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:由作法可知,点
为线段
的中点.连接
.
∵
为
的直径,
∴
_________
(_________)(填推理的依据).
∴
.
∵点
在
上,
∵
是
的切线(_________)(填推理的依据).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/10/f3b6e6c8-f3f3-4e6e-9714-bf0a7dab3cc5.png?resizew=152)
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
作法:(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64dc1ab9bf65cfdaac7633e9a7958ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
(2)作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(4)作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:由作法可知,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac20045a72dbb14bf84dcc89bc95fb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb2b741b79d32f985bf55cf6a8e6422.png)
∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2023-06-01 13:55:55
|
相似题推荐
解答题-作图题
|
较易
(0.85)
【推荐1】如图,在
中,
,点
在
边上且点
到点
的距离与点
到点
的距离相等.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/2fd0d9fc-146b-48a5-937a-f38227ebf812.png?resizew=90)
(1)利用尺规作图作出点D,不写作法但保留作图痕迹;
(2)连接
,若
的底边长为3,周长为17,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/2fd0d9fc-146b-48a5-937a-f38227ebf812.png?resizew=90)
(1)利用尺规作图作出点D,不写作法但保留作图痕迹;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
您最近一年使用:0次
解答题-作图题
|
较易
(0.85)
【推荐2】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/e50e8088-11a9-441a-9654-6bf2f06ec5f9.png?resizew=228)
(1)在
边上求作点
,使得
;(要求:尺规作图,不写作法,保留作图痕迹)
(2)在(1)所作的图形中,连接
,试说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/e50e8088-11a9-441a-9654-6bf2f06ec5f9.png?resizew=228)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(2)在(1)所作的图形中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a501d173925528149d079e30153cefdf.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】如图,在△ABC中,
,以腰
为直径作半圆,分别交
、
于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/a72385cf-68e0-43d9-8a4e-44d3fde7ed47.png?resizew=131)
(1)若
,求弧
的长;
(2)连结
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ce344cc52aa23dd89091feb1b85ecd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/a72385cf-68e0-43d9-8a4e-44d3fde7ed47.png?resizew=131)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456e0f77d83975fdbdb60b499cb5b521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
您最近一年使用:0次
解答题-作图题
|
较易
(0.85)
名校
【推荐2】下面是小立设计的“过圆上一点作这个圆的切线”的尺规作图过程.
已知:
及圆上一点A.
求作:直线
,使得
为
的切线,A为切点.
作法:如图,
①连接
并延长到点C;
②分别以点A,C为圆心,大于
长为半径作弧,两弧交于点D(点D在直线
上方);
③以点D为圆心,
长为半径作
;
④连接
并延长,交
于点B,作直线
.
直线
就是所求作的直线.
根据小立设计的尺规作图过程,完成下面的证明.(说明:括号里填推理的依据)
证明:连接
.
∵ ①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542c8be33859cf9957aaa447f896b212.png)
∴点C在
上,
∴
是
的直径.
∴ ②
.( ③ )
∴
④ .
∵
是
的直径,
∴
是
的切线.( ⑤ )
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/2023/11/30/b79c174c-7df0-4417-935a-71515c0649cd.png?resizew=108)
作法:如图,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/0b9757a0-d435-4800-be3d-be7a49285319.png?resizew=183)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
②分别以点A,C为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
③以点D为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
根据小立设计的尺规作图过程,完成下面的证明.(说明:括号里填推理的依据)
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∵ ①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542c8be33859cf9957aaa447f896b212.png)
∴点C在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴ ②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
【推荐1】如图,以
的边
的长为直径作
,交
于点D,若
,求证:
是
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/25509a5df044b4b89b4fdec1d19b4caa.png)
![](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/2022/8/11/b2cd6788-52b3-4c72-a3b0-2b6f34b7d555.png?resizew=161)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图,在
中,
,延长
到点D,以
为直径作
,交
的延长线于点E,延长
到点F,使
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/106569b9-ea96-4a84-9fdf-2fdc7351dbf8.png?resizew=110)
(1)求证;
是
的切线;
(2)若
,求扇形
的面积(结果保留π).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193ea44749f1c64c8723e84a57d15cb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/106569b9-ea96-4a84-9fdf-2fdc7351dbf8.png?resizew=110)
(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/194852e056a6a2b58f58b1bc73e4d0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f87bc10632de183256edc87c82f8382.png)
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