如图,在平行四边形ABCD中,连接对角线AC,E,F,分别为AC上的两点且
,连接BE,BF,DE,DF.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2972691918299136/2977943808524288/STEM/18ce1bc8-4caa-413f-8800-2849f580340b.png?resizew=221)
(1)求证:
.
(2)对
添加一个条件______,使四边形BEDF是菱形,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2972691918299136/2977943808524288/STEM/18ce1bc8-4caa-413f-8800-2849f580340b.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
2022·新疆阿克苏·一模 查看更多[4]
2022年新疆库车市九年级中考第一次模拟数学试题(已下线)专题1.3 菱形的性质与判定(巩固篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)山东省德州市陵城区2021-2022学年八年级下学期期末数学试题江苏省泰州市泰兴市2022-2023学年八年级下学期期末数学试题
更新时间:2022-05-12 19:05:05
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【推荐1】如图,在平行四边形ABCD中,过点D作
于点E,点F在边CD上,且
,连接AF、BF.
![](https://img.xkw.com/dksih/QBM/2022/3/15/2936875606794240/2937629006405632/STEM/15b081701d3f41c98b93b205ef5c4c89.png?resizew=162)
(1)求证:四边形DEBF是矩形;
(2)若AF平分∠DAB,
,
,求BF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbac105bfc339f2371034b5ea38b2938.png)
![](https://img.xkw.com/dksih/QBM/2022/3/15/2936875606794240/2937629006405632/STEM/15b081701d3f41c98b93b205ef5c4c89.png?resizew=162)
(1)求证:四边形DEBF是矩形;
(2)若AF平分∠DAB,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f5c775fe0ca1e5b432a6632de2b11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed650e192b6e94b4a99c05fb9ea93c4.png)
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【推荐2】如图,在
中,
,垂足分别为G 、H,E 、F分别是
、
的中点,连接
.
;
(2)连接
,若
,则四边形
的面积为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b85245a6706ad1cc1d6ded96460ee1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f654de00ff27ba9229298f506d3703d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd02d4fb32d1be108e2d0660f1b9b10.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259017b7f38f6751cf955068933e8e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1522a9c3b2466395570c2689a4055584.png)
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【推荐1】如图,在
中,点D是
的中点,点E,F分别在线段
及其延长线上,且
.给出下列条件:①
;②
平分
;③
;请你从中选择一个恰当的条件使四边形
是菱形,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb90434b6da93bdc6590f769ef118b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb65bee4fb8c2cbdd36e318cd652f928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49404e6b19a342401a80d9feb1144605.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/8163d362-256c-444d-b86e-be62b6ebb6e8.png?resizew=189)
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【推荐2】(2011贵州安顺)如图,在△ABC中,∠ACB=90°,BC的垂直平分线DE交BC于D,交AB于E,F在DE上,且AF=CE=AE.
⑴说明四边形ACEF是平行四边形;
⑵当∠B满足什么条件时,四边形ACEF是菱形,并说明理由.
⑴说明四边形ACEF是平行四边形;
⑵当∠B满足什么条件时,四边形ACEF是菱形,并说明理由.
![](https://img.xkw.com/dksih/QBM/2011/8/8/1573236749115392/1573236799365120/STEM/91221b113f5e488a8784a8d384c5dfd1.png?resizew=183)
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【推荐1】如图,在
中,
,
是边
的中线,过点D作
,且
,连接
交
于F.
是菱形.
(2)若
,菱形
的面积为
,则
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab34c8e368a7a2346a3922f5c532823d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7812fb18d08020f2d6c2633dc79b8ac3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7163395f9aaa29be7f6b3106ba48b744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b037c85cc86bb395101f85797bab6028.png)
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【推荐2】如图1,
是圆
外一点,
,
为圆上两点,连接
,
,分别交圆
于
,
两点,
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/81916d9d-e648-4c21-9be4-db9296a4ff11.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/42bf64b7-4892-44fe-9dd3-7676e78ac76d.png?resizew=197)
(1)求证:
;
(2)如图2,延长
交
于点
,连接
,
,当点
为
中点时,求证:四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/81916d9d-e648-4c21-9be4-db9296a4ff11.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/42bf64b7-4892-44fe-9dd3-7676e78ac76d.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.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/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4787e3f05a0f571753c403d1e7060d0.png)
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