尺规作图
已知:
.
求作:
,使
.
(不写作法,保留作图痕迹,画在答题纸的方框中)
写出这样作图的两点依据:①________________________________;②________________________________.
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d3bf6663cc3fabff4914a8e37f7c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd122ff05cfc71706dcdae0b67a6bfe7.png)
(不写作法,保留作图痕迹,画在答题纸的方框中)
写出这样作图的两点依据:①________________________________;②________________________________.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/2f1877ff-5c36-4056-a203-ec64c01e1ee7.png?resizew=141)
20-21八年级上·北京西城·阶段练习 查看更多[2]
更新时间:2020-12-09 13:37:35
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知
是
的角平分线,且
为
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/174a89ba-6f2c-4b15-9a9b-b45143261ee7.png?resizew=160)
(1)写出图中所有的全等三角形;
(2)求证:
.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/174a89ba-6f2c-4b15-9a9b-b45143261ee7.png?resizew=160)
(1)写出图中所有的全等三角形;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,点
、
、
、
在一条直线上
,
,
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2899111643185152/2901402103259136/STEM/1b9672ce18664af48bab44dc24befa2c.png?resizew=262)
(1)求证:
;
(2)若
,
,求
的度数.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d6e7ef3f341fd85acde9f60eaaff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47a70a2811c174e73ce1beeb80c75c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2899111643185152/2901402103259136/STEM/1b9672ce18664af48bab44dc24befa2c.png?resizew=262)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1d6f0530c49174047e866dbf2ae1ea4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bc5d63eb4d6d2a3c88313f82a09c31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,四边形
中,
,连接
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/e1b98027-fe92-4c01-addf-9e394b022f51.png?resizew=161)
(1)在
的延长线上求作一点
,使得
,并连接
;(保留作图痕迹,不写作法)
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc33c014fcd3091ce7e549bb5f2cd41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ec0ea92bc169162d35164fc4b9d492.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/e1b98027-fe92-4c01-addf-9e394b022f51.png?resizew=161)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b280b59e1c6e1a656c32dc758fb627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4655afe9ae5b91bee10a7ea83aa34e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,已知正方形ABCD,点E在边BC上,连接AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/f29cf9ee-1b83-4f58-bb9a-95800d041203.png?resizew=188)
(1)尺规作图:作∠ADF,使∠ADF=∠BAE,点F是∠ADF的边与线段AB的交点(不写作法,不写结论,保留作图痕迹);
(2)求证:AE=DF且AE⊥DF.
证明:设AE交DF于点T.
在正方形ABCD中,DA=AB,
∠DAF=∠B=90°,
又∵
∴△DAF≌△
∴ , .
∵∠BAE+∠DAT=90°,∴∠ADF+∠DAT=90°.∴∠ATD=90°.
∴AE⊥DF,∴AE=DF,AE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/f29cf9ee-1b83-4f58-bb9a-95800d041203.png?resizew=188)
(1)尺规作图:作∠ADF,使∠ADF=∠BAE,点F是∠ADF的边与线段AB的交点(不写作法,不写结论,保留作图痕迹);
(2)求证:AE=DF且AE⊥DF.
证明:设AE交DF于点T.
在正方形ABCD中,DA=AB,
∠DAF=∠B=90°,
又∵
∴△DAF≌△
∴ , .
∵∠BAE+∠DAT=90°,∴∠ADF+∠DAT=90°.∴∠ATD=90°.
∴AE⊥DF,∴AE=DF,AE⊥DF.
您最近一年使用:0次