如图,
是菱形
的对角线,
,请用尺规作图,在
上找一点
,使
.(不要求写作法,保留作图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f5796e87531209a2eb8874fe7e0c93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/caaf95bc-8222-433d-92df-64c15ce79196.png?resizew=220)
更新时间:2023-12-18 14:35:01
|
相似题推荐
解答题-作图题
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【推荐1】如图,在△ABC中,AB=AC=4,∠A=36°.
(1)在AC边上确定点D,使得△ABD与△BCD都是等腰三角形.(要求:尺规作图,保留作图痕迹,不写作法)
(2)在(1)的条件下,求BC的长.
(1)在AC边上确定点D,使得△ABD与△BCD都是等腰三角形.(要求:尺规作图,保留作图痕迹,不写作法)
(2)在(1)的条件下,求BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/9d6a5a62-488b-41ce-8200-3fea6b3bea6f.png?resizew=102)
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解答题-作图题
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适中
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【推荐2】尺规作图之旅:如图
是一副纯手绘的画作,其中用到的主要工具就是直尺和圆规,在数学中,我们也能通过尺规作图创造出许多带有美感的图形.尺规作图起源于古希腊的数学课题,只允许使用圆规和直尺,来解决平面几何作图问题.
而这些尺规作图的背后都与我们学习的数学原理密切相关,下面是用尺规作一个角等于已知角的方法及说理,请补全过程.
已知:如图
,
,
使
.
作法:①如图,以
为圆心,以______为半径画弧,分别交
,
于点
,
;
②画一条射线
,以点
为圆心,以______长为半径画弧,交
于点
;
③以______为圆心,以______长为半径画弧,交前面的弧于点
,
④作射线
,
就是所求作的角.
(2)如图
,
,过点
画射线
,则
,
,
,
,
求证:
,
证明:
,
≌
.(______)
所以
.(______)
(3)请按照上面的范例,完成尺规作图:
①在图
中画出
的角平分线;
②在图
中直线上找到一点
,使它到点A,点
的距离相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
已知:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3d51307daa0cfab77eec9311d91bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
作法:①如图,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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②画一条射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713877f832ddbfc9d52bd9902cda13b4.png)
③以______为圆心,以______长为半径画弧,交前面的弧于点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
④作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6637859805b7b01f7a9a64771563406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3d51307daa0cfab77eec9311d91bf.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6637859805b7b01f7a9a64771563406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec841221c64807bdb8ce6fbac6ed013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d1b5e4a70bb62763b35bb7cbd01912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063be481ae445e25b5b98fb3870efd16.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c1198e889b163eb77140a0915196ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fca1a15b67c2375e838fa0937748e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2b4890319264aa23ad9b059d05b458.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
(3)请按照上面的范例,完成尺规作图:
①在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
②在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/23ad7ff3-c73e-4bcf-afdd-cbcd2c41e5de.jpg?resizew=136)
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解答题-问答题
|
适中
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【推荐1】如图,在
中,
,
,
的垂直平分线交
于点
,交
于
,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3fda054d34b61278cf78238b4eaf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536431685d34a1cb4d916e0dc8147a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2019/11/6/2327970334818304/2328247311548416/STEM/d341a9d6777b4f38a6ea6ae428feda31.png?resizew=165)
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解答题-作图题
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适中
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【推荐2】如图,已知直线l及直线l外一点P,按照如下步骤进行尺规作图:
①在直线l上取一点A,连接
;
②分别以P、A为圆心,大于
的长为半径画弧,分别交于M、N两点,作直线
,交直线l于点B;
③以O为圆心,
长为半径画弧,交直线
于另一点Q,作直线
.
根据上述尺规作图的步骤和痕迹,请回答下列问题:
(1)下列结论不一定成立的是( )
A.
垂直平分
B.M是
的中点 C.
(2)若
,求
的长.
①在直线l上取一点A,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
②分别以P、A为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b774445d98675f8de1d529ccc7bee9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
③以O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/39e8e579-48dc-4d1f-a8c2-86860abd52cf.png?resizew=180)
根据上述尺规作图的步骤和痕迹,请回答下列问题:
(1)下列结论不一定成立的是( )
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0712a792667fa62975d11d19a7e85e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
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解答题-作图题
|
适中
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【推荐1】尺规作图(要求:不写作法,保留作图痕迹)
如图,已知线段
,
,垂足为A.
求作:
,使
分别与AK、AR相切,圆心O与点A的距离等于a.
如图,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88250576ff7428d193b725e86401b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b11cb297edc8288ea9a1f293aacff2c.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/a4aedf60-daf7-453a-891b-6a923516f674.png?resizew=318)
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解答题-证明题
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【推荐2】在数学课上,老师提出如下问题,尺规作图:过直线外一点作已知直线的垂线.
已知:直线
及其外一点
.求作:
的垂线,使它经过点
.小华同学按下列步骤作图(如图):
,使点
和点
在直线
的两旁;
②以点
为圆心,
长为半径作弧,交直线
于点
和
;
③分别以点
,
为圆心,线段
的长度为半径作弧,两弧相交于点
;
④作直线
,直线
即为所求.
(1)证明:
直线
;
(2)若点
到直线
的距离为
,
,求四边形
的面积.
已知:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
③分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/c5db41a1f31d6baee7c69990811edb9f.png)
④作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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适中
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【推荐3】如图,四边形ABCD中,AB∥CD,AC为对角线.
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962253082066944/3017668195164160/STEM/dc3d8120b08c4e3993da3157bfe8af1f.png?resizew=187)
(1)作AC的垂直平分线分别交AB、AC、DC于点E、F、G.连接AG、CE.(尺规作图,不写作法和结论,保留作图痕迹)
(2)在(1)题所作的图形中,求证:四边形AECG是菱形.(请补全下面的证明过程)
证明:∵ ____________①
∴ ∠EAF =∠GCF
∵ EG垂直平分AC
∴ AF=CF
在△ AEF与△ CGF中
②
∴ △ AEF≌△CGF
∴ AE=CG
又∵ AB//CD
∴______________________③
又∵EG⊥AC
∴________________________④
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962253082066944/3017668195164160/STEM/dc3d8120b08c4e3993da3157bfe8af1f.png?resizew=187)
(1)作AC的垂直平分线分别交AB、AC、DC于点E、F、G.连接AG、CE.(尺规作图,不写作法和结论,保留作图痕迹)
(2)在(1)题所作的图形中,求证:四边形AECG是菱形.(请补全下面的证明过程)
证明:∵ ____________①
∴ ∠EAF =∠GCF
∵ EG垂直平分AC
∴ AF=CF
在△ AEF与△ CGF中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f0d77bb7cd267bd4a0e66bd8ec702.png)
∴ △ AEF≌△CGF
∴ AE=CG
又∵ AB//CD
∴______________________③
又∵EG⊥AC
∴________________________④
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在菱形
中,
,
,
为正三角形,点
,
分别在菱形的边
,
上滑动,且
,
不与
,
,
重合.当点
在
,
上滑动时,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/871c4389-7aea-4b66-a8b3-423400026cbd.png?resizew=165)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在菱形ABCD中,对角线AC,BD相交于点O,点E是AB的中点.已知AC=8cm,BD=6cm,求OE的长.
![](https://img.xkw.com/dksih/QBM/2019/1/22/2124171091902464/2126219766644736/STEM/2903a69e10184649acf615e96cc0a8d4.png?resizew=113)
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