用圆规、直尺作图,不写作法,但要保留作图痕迹.
已知:线段a,b.
求作:菱形ABCD,使
,
.
已知:线段a,b.
求作:菱形ABCD,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/896f388f-f31d-4a1f-b0ca-301904b482f5.png?resizew=196)
更新时间:2022-04-06 14:16:36
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解答题-问答题
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【推荐1】如图,四个点
、
、
、
,根据下列要求画图:
(1)画直线
;
(2)做射线
;
(3)画线段
;
(4)连接
,并将其反向延长至
,使
.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/1/0eb3dbf1-9d88-4ae0-9e2e-ec0b11c39148.png?resizew=132)
(1)画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)做射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)画线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(4)连接
![](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/c8df4cab7eba6ec0757ed086af7c7741.png)
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解答题-作图题
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【推荐2】如图1,已知直线
.
(1)请用圆规和无刻度直尺,根据以下步骤完成作图(尺规作图,保留作图痕迹,不写作法):
①过点
作
的垂线;
②在
的垂线上截取
(点
在
上方);
③连接
;
④以点
为圆心,
长为半径作弧,交
于点
;
⑤以点
为圆心,
长为半径作弧,交
于点
;
(2)如图2,点
在线段
上,且
,若
,则称点
是线段
的一个黄金分割点.在(1)的条件下,证明:点
是线段
的一个黄金分割点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/a06cac54-2f04-4ddc-84e1-70803ef391a7.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/23dd5dcc-2df2-498c-b08b-8ed3d623469e.png?resizew=175)
(1)请用圆规和无刻度直尺,根据以下步骤完成作图(尺规作图,保留作图痕迹,不写作法):
①过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
④以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
⑤以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd982b3dd36c09a693825e40f3aa628.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e543cc00613234efaa2e6f1f28abbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
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【推荐1】如图,
为矩形ABCD对角线的交点,过
作
,分别交AD、BC于
、E,若AB=2cm,BC =4cm.
(1)求四边形AECF的面积;
(2)求EF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3abf3173133683369785897e67fa84.png)
(1)求四边形AECF的面积;
(2)求EF的长.
![](https://img.xkw.com/dksih/QBM/2018/11/5/2069243990966272/2070293545967616/STEM/6ad5f4195313477586bd55ad67caa6ea.png?resizew=229)
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解答题-证明题
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【推荐2】如图,在已知平行四边形ABCD中,AE平分∠BAD,与BC相交于点E,EF∥AB,与AD相交于点F.
求证:(1)四边形ABEF是平行四边形
(2)四边形ABEF是菱形.
求证:(1)四边形ABEF是平行四边形
(2)四边形ABEF是菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/3ab25904-d624-4093-b25b-dd4cd4df0ecb.png?resizew=203)
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