如图,在平行四边形
中,过点
作
于点
,点
在边
上,
,连接
,
.
(1)求证:四边形BFDE是矩形;
(2)若CF=3,BE=5,AF平分∠DAB,求平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(1)求证:四边形BFDE是矩形;
(2)若CF=3,BE=5,AF平分∠DAB,求平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2019/7/2/2238004722786304/2238264571731968/STEM/83e5e4133b1841b4b4520610d2baee3b.png?resizew=182)
更新时间:2019-05-21 18:50:50
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解答题-证明题
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【推荐1】如图,在平行四边形
中,点E、F分别为
中点,G、H分别在边
上,且
.
是平行四边形;
(2)若
,求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85814f051a479a1b04a46f70e96557a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de91bc787c1b5f66b407813a391d206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6baf820ff60f2015ae352f2b1bc3aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5406e7922357e0396a651e0cda56de93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e9cb4b8d305fee238e158c53c2448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5406e7922357e0396a651e0cda56de93.png)
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【推荐2】如图,点O是△ABC内一点,连结OB、OC,并将AB、OB、OC、AC的中点D、E、F、G依次连结,得到四边形DEFG.
![](https://img.xkw.com/dksih/QBM/2016/6/29/1574214551511040/1574214557876224/STEM/16e96646c2124ddebc3b599648ab17e8.png?resizew=185)
(1)求证:四边形DEFG是平行四边形;
(2)若M为EF的中点,OM=3,∠OBC和∠OCB互余,求DG的长度.
![](https://img.xkw.com/dksih/QBM/2016/6/29/1574214551511040/1574214557876224/STEM/16e96646c2124ddebc3b599648ab17e8.png?resizew=185)
(1)求证:四边形DEFG是平行四边形;
(2)若M为EF的中点,OM=3,∠OBC和∠OCB互余,求DG的长度.
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解答题-作图题
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【推荐1】小南在学习矩形的判定之后,想继续研究判定一个平行四边形是矩形的方法,他的想法是作平行四边形两相邻内角的角平分线,与两内角公共边的对边相交,如果这相邻内角的顶点到对应交点的距离相等,则可论证该平行四边形是矩形.
平分
交
于点
;
(2)已知:如图,在平行四边形
中,
平分
交
于点E,
平分
交
于点
,且
.求证:平行四边形
是矩形.
证明:
,
分别平分
,
,
,
.
四边形
为平行四边形,
,
,
① ,
,
,
,
② ,
,
,
.
在
和
中
,
.
,
,
,
③ ,
平行四边形
是矩形.
小南再进一步研究发现,若这组邻角的角平分线与公共边的对边延长线相交,结论仍然成立.因此,小南得出结论:作平行四边形两相邻内角的角平分线,与两内角公共边的对边(或对边延长线)相交,若这相邻内角的顶点到对应交点的距离相等,则 ④ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)已知:如图,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85f511236e5645290b9d06984558ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a8713b0b50e00ddc0baffeb62c6e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8d3818fd5e3e36be27d898e8062a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8644afba5451902a1d517ec584877a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9391370e7d493c4a1e75d25159523cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b207fd68ab1014f74d190e30a68040ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c96cd3c230f63e7acf5053b2b255c95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2754b35a7932e36312a71b0d0c3f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8cf51d8ce4ad7e0e7355b6a1ff970fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e94399c4924cf2a862737a2825fe4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3411384689995f6c3ff4108d1ffcbad.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13668f033d00acfc366f7e47949c4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b271d76c06d1aaea92b30c34d0d92d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70514b699c177fc53721c8251b04c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5279bd0b34bff51b7fe30b9c90c5d7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe9353e99abfcf4048066770298aea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844d86fb77ca8ec443f0bc073d4a68c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
小南再进一步研究发现,若这组邻角的角平分线与公共边的对边延长线相交,结论仍然成立.因此,小南得出结论:作平行四边形两相邻内角的角平分线,与两内角公共边的对边(或对边延长线)相交,若这相邻内角的顶点到对应交点的距离相等,则 ④ .
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【推荐2】如图,AB=AC,AE=AF,且∠EAB=∠FAC,EF=BC.求证:四边形EBCF是矩形.
![](https://img.xkw.com/dksih/QBM/2021/5/21/2725763536584704/2789391480537088/STEM/01cf1a04e2f34b009c45b3e146947f2f.png?resizew=112)
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