如图,
中,
、
分别是
、
的中点,
,过点
作BF//CE,交
的延长线于点
.
(1)求证:四边形
是菱形.
(2)若
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e09593b456ffe8daba6ec1f5d50c225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/20b7db64-2796-4f25-9795-18fe71587466.png?resizew=150)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e557ac8c744f9961a6d544a75321e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
更新时间:2022-06-05 14:30:53
|
相似题推荐
解答题-证明题
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【推荐1】如图,
,
交
于点C,D,
是半径,且
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/d9a13023-b064-4423-b630-058bb132792f.png?resizew=140)
(1)求证:
.
(2)若
,
,求
直径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/d9a13023-b064-4423-b630-058bb132792f.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a887a4acb44abdfff13ecb0d0fb3c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】(1)计算:
;
(2)如图,在
中,
分别是
的中点,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70626cf6d440e7b96ca76f5e54b5165.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9f956ed3b710960a9833b174f81d312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5545dc3211671941048034af38092fa6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/df21f401-21a6-4915-b859-d0bf5b528112.png?resizew=142)
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【推荐2】如图,AB是⊙O的直径,D是弦AC延长线上一点,且AB=BD,DB的延长线交⊙O于点E,过点C作CF⊥BD,垂足为点F.
(1)CF与⊙O有怎样的位置关系?请说明理由;
(2)若BF+CF=6,⊙O的半径为5,求BE的长度.
(1)CF与⊙O有怎样的位置关系?请说明理由;
(2)若BF+CF=6,⊙O的半径为5,求BE的长度.
![](https://img.xkw.com/dksih/QBM/2019/7/7/2241930115031040/2243617426259968/STEM/47b5c625b7904614b70ae069cb52869b.png?resizew=209)
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【推荐1】如图,在菱形ABCD中,对角线AC与BD交于点O.过点C作BD的平行线,过点D作AC的平行线,两直线相交于点E.若CE=1,DE=2,求四边形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2021/6/16/2744335535300608/2744829374308352/STEM/083e46b823d248208f2bae658edea9e9.png?resizew=237)
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【推荐2】如图,在
的正方形网格中,每一个小正方形的边长均为1,请按下列要求作格点图形.
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733783326244864/2733817037676544/STEM/add5e661772f4693954de9ec2f08af27.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733783326244864/2733817037676544/STEM/8be14311a8674e0c8108130ee4ffb74d.png?resizew=200)
(1)在图1中,以
为边画一个面积为12的平行四边形.
(2)在图2中,以
为边画一个面积最小的菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a96e9c2e2a15130d1d56a1d0e16b72.png)
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733783326244864/2733817037676544/STEM/add5e661772f4693954de9ec2f08af27.png?resizew=205)
![](https://img.xkw.com/dksih/QBM/2021/6/1/2733783326244864/2733817037676544/STEM/8be14311a8674e0c8108130ee4ffb74d.png?resizew=200)
(1)在图1中,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在图2中,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐1】已知:如图,在四边形ABCD中,AC=BD,E、F、G、H分别是AB、BC、CD、DA的中点,判断四边形EFGH的形状,并说明理由.
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真题
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【推荐2】如图,
为
的直径,点
在
上,
与
交于点
,
,连接
.求证:
(1)
;
(2)四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548ed85c3c15241150c8550785f0804d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae58559b81bad583f5ef24fb44c292e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ab83ca64f40930cbb82f2a8db66052.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160c9d2f23a376308cac8648e7d1be67.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab158dd9e96abcae0f115f54fa66c5b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/10/2761461503418368/2763517558185984/STEM/b8d4f579-41cd-4d53-bfd9-4d67d9544917.png)
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