如图,四边形
是平行四边形,
是其对角线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/5e508535-830c-4875-9deb-489ff6c069b5.png?resizew=213)
(1)用尺规完成以下基本作图:作
的垂直平分线
,分别交
,
,
于点
,
,
;(保留作图痕迹,不写作法)
(2)求证四边形
是否为菱形.
解:四边形
为菱形.证明如下:
∵四边形
是平行四边形,
∴①______________,
∴
.
∵②______________,
∴
,
,③______________.
在
与
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ec0d550858f50f8096e16585e334e.png)
∴
,
∴⑤______________,
∴
,
∴四边形
是菱形.
![](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/2024/3/26/5e508535-830c-4875-9deb-489ff6c069b5.png?resizew=213)
(1)用尺规完成以下基本作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/1dde8112e8eb968fd042418dd632759e.png)
(2)求证四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
解:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴①______________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18c51dfb527bc2519fbfea925c5d8d4.png)
∵②______________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74625390340982140e449e07663579a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c525358262126a51fbb598d58f3e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ec0d550858f50f8096e16585e334e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748480d59e7049430b10c94530a820fd.png)
∴⑤______________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671eab9d0b5621d93972b7e62b816766.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
2023·重庆·模拟预测 查看更多[1]
更新时间:2024-03-26 22:12:14
|
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【推荐1】已知:如图,在直角三角形ABC中,∠ACB=90°,BC的垂直平分线交BC点D,交AB于点E,过点A作AF∥CE交直线DE于点F.
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【推荐2】如图,四边形ABCD中,AB=AD,点B关于AC的对称点B'恰好落在CD上,若∠BAD=α,则∠ACB的度数为?
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解答题-作图题
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【推荐1】如图
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解答题-作图题
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【推荐2】如图,以
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/f81401f8-86de-4a67-90ae-c7a442f422ad.png?resizew=115)
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②若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)作
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②若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db4d131f072fdbd025a887bcdf35742.png)
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解答题-证明题
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适中
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【推荐1】我们把依次连接任意四边形各边中点得到的四边形叫做“中点四边形”.如图,在四边形
中,E、F、G、H分别是边
、
、
、
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.
的形状是 ;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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适中
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【推荐2】已知:如图,点D、E、F分别在△ABC的边AB、AC、BC上,DF∥AC,BD=2AD,AE=2EC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/e64ca2ce-4af9-4999-9feb-66b5eea3d81a.png?resizew=195)
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