1 . 在数学课上,爱动脑筋的小孙同学提出了一个问题:已知
,求作一个以
为内角的菱形
经过课堂讨论,有的学习小组提出了如下尺规作图方案:
以点A为圆心,以适当长为半径画弧,与
,
分别交于
,
两点,再分别以
,
两点为圆心,以相同的长度为半径
画两条弧,两弧交于
内一点
;
以A,
为圆心,以大于
的长为半径作弧,两弧交于
,
两点;
连接
交
于点
,交
于点
,连接
,
.
请你根据上述尺规作图方案,完成下列问题:
(1)使用直尺和圆规补全图形;
保留作图痕迹![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)证明四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af2ec59537d98c0aa3e0be6608ba74e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c8034aef9ecb15c709331282b96eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
请你根据上述尺规作图方案,完成下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/77c8184e-72e6-45aa-9ede-7e5747a69a57.png?resizew=136)
(1)使用直尺和圆规补全图形;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2 . 如图,在
中,
,
的垂直平分线交
于点D,交
于点E,
的平分线交
于点F,两线交点为点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/3b333bc3-b950-4306-b83b-6a346ffdb614.png?resizew=180)
(1)依题意补全图形(要求:尺规作图,保留作图痕迹,不写作法);
(2)连接
,若
,
的周长是
,
_____________;
(3)连接
,设
,则
__________;(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/3b333bc3-b950-4306-b83b-6a346ffdb614.png?resizew=180)
(1)依题意补全图形(要求:尺规作图,保留作图痕迹,不写作法);
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fae188b381c5ba01b3d9d742c687dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9822e15763be5cb6c49936df274a6748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f665330943393db16b52a94b464f05f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39764293c76b41c259e3c640f7420456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
3 . 下面是小明设计的“作一个含
角的直角三角形”的尺规作图过程.已知:如图1,直线
及直线
上一点
.
求作:
,使得
.
作法:如图2,
①在直线
上取点
;
②分别以点
为圆心,
长为半径画弧,交于点
;
③作直线
,交直线
于点
;
④连接
.
为所求作三角形.
根据小明的设计,解答下列问题:
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)写出证明过程和依据.
证明:连接
.
∵
,
∴
是 三角形.
∴
.
∵
,
∴点B,E在线段
的垂直平分线上( ).
∴
.
∴
.
∴
( ).
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/b52195fa-de22-4b6e-89f9-0f75a8e345ff.png?resizew=362)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb25819587ec72d4b6370e70cd94103.png)
作法:如图2,
①在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9521effc99744da7d1445af9681a3ef.png)
③作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
根据小明的设计,解答下列问题:
(1)使用直尺和圆规,依作法补全图形(保留作图痕迹);
(2)写出证明过程和依据.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bf5a4a3b2b1b7f8fc6d4b5268854ce.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f82d8295477679460318bca1e7604a3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a656870d2fde413033198c4dc7efd1.png)
∴点B,E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2055e9bb4f0e511ac588c2457da658.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
您最近一年使用:0次
2023-08-25更新
|
77次组卷
|
2卷引用:辽宁省沈阳市2022-2023学年八年级下学期5月月考数学试题
名校
4 . 如图,
中,
,
的平分线交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/2/3122301076414464/3158575223717888/STEM/bc957fb965924b3d9fe87a82da87a817.png?resizew=209)
(1)尺规作图:作
的垂直平分线,分别交
、
、
于点
、
、
,连接
、
;(不写作法,保留作图痕迹)
(2)在(1)中所作的图形中,求证:
.补全下列证明过程:
证明:∵
垂直平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴
,
___________①___________
∵
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴___________②___________
在
和
中,
,
∴
,∴___________④___________
∴
![](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/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2022/12/2/3122301076414464/3158575223717888/STEM/bc957fb965924b3d9fe87a82da87a817.png?resizew=209)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)在(1)中所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2779662cf36bab7e33534c1ace192281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴___________②___________
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00870385ca7f3214e2971779eb4c7904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7572ecc467c061ef71cf4486ec63ec3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5eda4461c717f0c69037c3548631a7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936f4299ccd3ac4737416facc000b92c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a3600b1760a63a10c9a0429b439dc1.png)
您最近一年使用:0次
2023-01-23更新
|
237次组卷
|
2卷引用:重庆实验外国语学校2022-2023学年八年级下学期入学测试数学试题
5 . 已知:在矩形
中,
是对角线.求作:菱形
,使点
分别在边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/3cc201cd-14ec-45d9-bfb3-c2fff83b0153.png?resizew=129)
作法:如图,①分别以点
,
为圆心,大于
长为半径画弧,两弧在线段
两侧分别交于点
;
②作直线
交
于点
,与
分别交于点
;
③连接
.
所以四边形
就是所求的菱形.
根据上面设计的尺规作图过程,
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接
.
∵
,
∴
是
的垂直平分线 (填推理根据).
∴
.
∴
.
∵四边形
是矩形,
∴
,
∴
.
∴
.
又
,
∴
.
∴
.
∴
.
∴
.
又∵
,
∴四边形
是平行四边形 (填推理根据).
又∵
,
∴四边形
是菱形 (填推理根据).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/3cc201cd-14ec-45d9-bfb3-c2fff83b0153.png?resizew=129)
作法:如图,①分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93148adbc6e856da9a9d263f485d003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b0beed78d69acf9bcc48a9ce712930.png)
所以四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
根据上面设计的尺规作图过程,
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3623b12228f0a226ab386699277163.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c741f4b99daf90435d30a73bf2e73e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc1a8e1de618493faf62d1e75638a49.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7654fd5f16d0b9c10450c11fc3506ad.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442f8b83cc5d1de2367db3c33bbb34ea.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e7a62af4f7d0f53ed66d724a606fea.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2210f0afac24bfb7e217503f06ef8563.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b2669be05c12ea71eaf15bd0886e1f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21204d1c00149a21f59c004f6b927237.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c646ec346afe29a32e98115df67a6c65.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f3a56d067d8a0085e7740d1ff06c4d.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384ffba86ff08ce9e783d5d1bc51686.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次
6 . 根据题意,先补全图形,再作答:
如图所示,在
中,作
边的垂直平分线,交
于点
,交
于点
,连接
.若
,
,证明:
.
(补全图形要求:尺规作图,不写作法,保留作图痕迹)
如图所示,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0374c406b563f0d258aa5c2654bbd06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a427709e6575431882877cda3b59ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
(补全图形要求:尺规作图,不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/0f692a5e-ecb1-420f-9cd7-83830cb1794a.png?resizew=174)
您最近一年使用:0次
7 . 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)
您最近一年使用:0次
名校
8 . 下面是小雪设计的“作以已知线段为斜边的等腰直角三角形”的尺规作图过程.
已知:线段
.
求作:以
为斜边的一个等腰直角
.
作法:
①分别以点
和点
为圆心,大于
的长为半径作弧,两弧相交于
、
两点;
②作直线
,交
于点
;
③以
为圆心,
的长为半径作圆,交直线
于点
;
④连接
.则
即为所求作的三角形.根据小雪设计的尺规作图过程:
(1)尺和圆规补全图形(保留作图痕迹):
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/0b49b5be-b233-47bf-ad30-eeb122d97270.png?resizew=149)
(2)证明:
为以
为斜边的等腰直角三角形.
已知:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求作:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
作法:
①分别以点
![](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/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
③以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)尺和圆规补全图形(保留作图痕迹):
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/0b49b5be-b233-47bf-ad30-eeb122d97270.png?resizew=149)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
名校
9 . 如图,在平行四边形
中,
为对角线.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/bafc0dae-e2e9-47a7-80d9-2176e6d7d6f7.png?resizew=190)
(1)用尺规作图完成以下基本作图:作线段
的垂直平分线,垂足为O,分别交
于点M,N.(保留作图痕迹,不写作法和结论.)
(2)根据(1)中作图,证明
.请你补全证明过程.
证明:∵四边形
是平行四边形,
∴___________①
∴
,
又∵MN垂直平分
,
∴
,
∴
②
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6e48c65a27b5cc5a66d40017afd453.png)
∴___________③
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/bafc0dae-e2e9-47a7-80d9-2176e6d7d6f7.png?resizew=190)
(1)用尺规作图完成以下基本作图:作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46c696ff5f123a482bae81cf9a1b570.png)
(2)根据(1)中作图,证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f3175a979c2f908d6c5665e14894b0.png)
证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴___________①
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99975b33887937bb8015296e3554306f.png)
又∵MN垂直平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9c7ac0b567ee3ad2ad3939bf370373.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c6e48c65a27b5cc5a66d40017afd453.png)
∴___________③
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f3175a979c2f908d6c5665e14894b0.png)
您最近一年使用:0次
10 . 小红发现,任意一个直角三角形都可以被分割成两个等腰三角形.
已知:在
中,
.
求作:直线
,使得直线
将
分割成两个等腰三角形.
下面是小红设计的尺规作图过程,作法:①作
的垂直平分线
,交斜边
于点D;②作直线
,则直线
就是所求作的直线.
根据小红设计的尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2023/3/1/3185117573431296/3185188409729024/STEM/52a95aa4900c4ee0b0ae6da4c0da4d35.png?resizew=176)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)证明
和
都是等腰三角形.
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
下面是小红设计的尺规作图过程,作法:①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/9d78abbad68bbbf12af10cd40ef4c353.png)
根据小红设计的尺规作图过程,
![](https://img.xkw.com/dksih/QBM/2023/3/1/3185117573431296/3185188409729024/STEM/52a95aa4900c4ee0b0ae6da4c0da4d35.png?resizew=176)
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93f77fc658b1f307566bb05d6d629fb.png)
您最近一年使用:0次