尺规作图(只保留作图痕迹,不要求写出作法)
如图,已知
和线段
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
求作:(1)
,使
,
,
.
(2)在(1)的条件下,作
边上的中线
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63433f9c352cd4b3f8515265b56608d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
求作:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6cf66ad93b3b3c3fec5fd70ef1fbea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a120e7d05950c06e9e6737c36b4b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
(2)在(1)的条件下,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/eccaf8bb-296b-49a1-a46f-4f721f02a5f8.png?resizew=268)
更新时间:2020-04-03 14:22:27
|
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解答题-作图题
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【推荐1】如图,在矩形
中,
.
(1)尺规作图:在线段
上求作一点
,使得
;(保留作图痕迹,不写作法与证明)
(2)连结
,若点
为边
的中点,连结
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/4e93916c-a086-489c-88da-f4aa103e18ff.png?resizew=186)
(1)尺规作图:在线段
![](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/da4f63da042e57db1b4562dac4a29db7.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7388a24c552763aa135efb321c7a1a.png)
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解答题-证明题
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【推荐2】人教版初中数学教科书八年级上册第35-36页告诉我们作一个三角形与已知三角形全等的方法:已知:
.
求作:
使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7856371e871f6f78b4dbf9927ad944.png)
作法:如图.
(1)完成证明过程;
(2)这种作一个三角形与已知三角形全等的方法依据是______.(填序号)
①
②
③
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7856371e871f6f78b4dbf9927ad944.png)
作法:如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/e932d9d7-ef1f-40db-889f-73d390ad5735.png?resizew=327)
(1)完成证明过程;
(2)这种作一个三角形与已知三角形全等的方法依据是______.(填序号)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4194089bef4e0d583fc1e69f0e235ae5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd03960ade27c927e34ee28cb222615c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef21f6c326b310efdc1bc2f377b2fc9.png)
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解答题-问答题
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(0.85)
【推荐1】已知:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
(1)求作:
,使
.
(2)说明作一个角等于已知角的方法依据.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/c4015bc2-dbfd-446d-a1fb-dc360f0385cc.png?resizew=118)
(1)求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902b955418434177b1e13f0e0869abba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f03f9fd5b18d9f01aea60f0cbd7584.png)
(2)说明作一个角等于已知角的方法依据.
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解答题-作图题
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【推荐2】已知
和线段a,用尺规作一个△ABC,使
,
,且这两内角的夹边等于a(不要求写作法,保留作图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6cf66ad93b3b3c3fec5fd70ef1fbea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca9b9e0653305bc9aad519b443d95f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/04d99bb0-cffc-4ec7-b315-743363342f78.jpg?resizew=180)
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解答题-作图题
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名校
【推荐3】如图,在平行四边形ABCD中,BA⊥AD,点E是线段AD上的一点,连接BE.
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958610494414848/2960172512043008/STEM/f3d1c6eb-55fd-4bed-84a7-c0a2d52f4495.png?resizew=225)
(1)在线段BC上求作一点F,使得∠FDC=∠ABE(要求:尺规作图,不写作法,保留作图痕迹);
(2)在(1)所作的图中,证明:四边形BFDE为平行四边形的结论.
解:(2)证明:在平行四边形ABCD中,
∵BA⊥AD
∴
∴四边形ABCD是矩形
∴∠A=∠C,AB=CD,AD=BC
在
ABE和
CDF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69c35e00ec85afd96907bba458846d1.png)
∴
ABE≌
CDF(ASA)
∴ ,BE=DF.
∴AD﹣AE=CB﹣CF
∴
∴四边形BFDE为平行四边形(两边分别相等的四边形为平行四边形)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958610494414848/2960172512043008/STEM/f3d1c6eb-55fd-4bed-84a7-c0a2d52f4495.png?resizew=225)
(1)在线段BC上求作一点F,使得∠FDC=∠ABE(要求:尺规作图,不写作法,保留作图痕迹);
(2)在(1)所作的图中,证明:四边形BFDE为平行四边形的结论.
解:(2)证明:在平行四边形ABCD中,
∵BA⊥AD
∴
∴四边形ABCD是矩形
∴∠A=∠C,AB=CD,AD=BC
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69c35e00ec85afd96907bba458846d1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
∴ ,BE=DF.
∴AD﹣AE=CB﹣CF
∴
∴四边形BFDE为平行四边形(两边分别相等的四边形为平行四边形)
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解答题-作图题
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【推荐1】尺规作图:如图,在四边形ABCD内找一点P,使得点P到AB、AD的距离相等,并且点P到点B、C的距离也相等.(不写作法,保留作图痕迹).
![](https://img.xkw.com/dksih/QBM/2017/12/26/1846821285421056/1851847077912576/STEM/67e1b480a74b430293b91237d6df085d.png?resizew=176)
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解答题-作图题
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【推荐2】尺规作图(保留作图痕迹,不写作法):
如图,直线
表示一条公路,
、
表示两所大学,要在公路旁修建一个车站
,使车站到两所大学的距离相等.
![](https://img.xkw.com/dksih/QBM/2021/7/22/2769940487675904/2787181608804352/STEM/eacdd845a1e845499e61c600c79d95ec.png?resizew=178)
(1)请用尺规在图上找出点
;
(2)请说明你作图的依据.
如图,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2021/7/22/2769940487675904/2787181608804352/STEM/eacdd845a1e845499e61c600c79d95ec.png?resizew=178)
(1)请用尺规在图上找出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)请说明你作图的依据.
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