如图,在
中,点E,F分别在边
上,请你添加一个条件______ ,使四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd38e0d42026b953b2fd2ad3634ecb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
更新时间:2024-05-01 14:53:09
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【知识点】 利用平行四边形性质和判定证明解读
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【推荐1】如图,在
中,
,
,点
,
分别在边
,
上,且
,
交
于点
,
交
于点
,若
,
,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a7ccbd557f988d9ef8e70192ecf11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945f11a4e5087c25cd098714eff16068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/28/546b8f5d-dcc5-4ca3-ae9a-eb6bb2ebf3b6.png?resizew=119)
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【推荐2】阅读下面材料:
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平行线.
已知:直线l及其外一点A.
求作:l的平行线,使它经过点A.
小云的作法如下:
①在直线l上任取两点B,C;
②以A为圆心,以
长为半径作弧;以C为圆心,以
长为半径作弧,两弧相交于点D;
③作直线
.
直线
即为所求.
老师说:“小云的作法正确.”请回答:小云的作图依据是______ .
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平行线.
已知:直线l及其外一点A.
求作:l的平行线,使它经过点A.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/e4907a5b-ced8-4b82-b22b-6f9acf14c676.png?resizew=169)
小云的作法如下:
①在直线l上任取两点B,C;
②以A为圆心,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
③作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/f459caa4-1414-4ee1-91f3-f59c4e6e79b3.png?resizew=189)
老师说:“小云的作法正确.”请回答:小云的作图依据是
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