已知:如图,在平行四边形ABCD中,点E、F在AC上,且AE=CF.求证:BE=DF.
18-19八年级下·江苏淮安·期中 查看更多[8]
更新时间:2019-04-24 17:59:11
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【知识点】 利用平行四边形性质和判定证明解读
相似题推荐
解答题-证明题
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【推荐1】如图,四边形
是平行四边形,延长
至
,使点
是
的中点,连接
,
与
相交于点
.
(1)求证:
;
(2)当
时,求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44bbc8980c618319bab895a4d245e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/fc9d49eb-3522-4eef-9abf-84b88028a5f9.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546f5e3bf6a3b60f85ea730a6cd7b36e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e94dacf9ef98c98de9344a77079cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知
是
的直径,
于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/fcd7c4f9-5c8f-448b-976b-1bb6930f5bb9.png?resizew=321)
(1)如图1,延长
交
于点F,连接
并延长交
的延长线于点P,求证:
;
(2)如图2,过点B作
,垂足为点G,
交
于点H,连接
,且点O和点A均在
的左侧.若
,
,
.
①求
的半径;
②求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe664db8705cc96866ddfb2ba665d03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/fcd7c4f9-5c8f-448b-976b-1bb6930f5bb9.png?resizew=321)
(1)如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
(2)如图2,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9bff988abfbb5445c477e3f4a07ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df77cc6f8b81245d2699132b6d9f3ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34172bb77a715cba6a3905f243a0ff27.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
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解答题-作图题
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适中
(0.65)
【推荐3】请阅读下列材料,完成相应的任务:
无刻度直尺作图:“无刻度直尺”是尺规作图的工具之一,它的作用在于连接任意两点、作任意直线、延长任意线段.结合图形的性质,只利用无刻度直尺也可以解决一些几何作图问题.
如图1,已知点P是线段AB的中点,分别以PA、PB为边在AB的同侧作
与
,其中
,
,
.求作:线段PC的中点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/c01e68a4-23fe-49e8-8979-6b5350d41cba.png?resizew=473)
按照常规思路,用尺规作线段PC的垂直平分线,垂足即为PC的中点.仔细分析图形,你会发现,只用无刻度的直尺连接线段AD,AD与CP交点E即为PC的中点(如图2).
证明:连接CD.
,
(依据1),
,
,同理,
.
……
(1)【任务1】写出上述证明过程中依据1的内容:________.
(2)【任务2】请补全证明过程.
(3)【任务3】如图,在平行四边形ABCD中,点E是CD边的中点.求作:
,使
的面积与平行四边形ABCD的面积相等.(要求:利用无刻度直尺作图,保留作图痕迹,不写画法.)
无刻度直尺作图:“无刻度直尺”是尺规作图的工具之一,它的作用在于连接任意两点、作任意直线、延长任意线段.结合图形的性质,只利用无刻度直尺也可以解决一些几何作图问题.
如图1,已知点P是线段AB的中点,分别以PA、PB为边在AB的同侧作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4295489eddaed29f1bcf9222d9b9cc1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68bfae5002a90a2f2bb276cf116cc3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322c4c806f7b9d3ca80a29ca5da04916.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/c01e68a4-23fe-49e8-8979-6b5350d41cba.png?resizew=473)
按照常规思路,用尺规作线段PC的垂直平分线,垂足即为PC的中点.仔细分析图形,你会发现,只用无刻度的直尺连接线段AD,AD与CP交点E即为PC的中点(如图2).
证明:连接CD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b112c262801bc661dc554d4cfa5ea887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f718d3087310ac3a5566bddc0b63e162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8686c8f356ffa31e05da54f7c1d1d6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e919c82b08772aec59c1427df7441496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e859f9be655ca33afed51dc04e359e.png)
……
(1)【任务1】写出上述证明过程中依据1的内容:________.
(2)【任务2】请补全证明过程.
(3)【任务3】如图,在平行四边形ABCD中,点E是CD边的中点.求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/87bbd197-f19d-4f4e-9dae-247b82073b81.png?resizew=178)
您最近一年使用:0次