用一根铁丝围成正方形、长方形、正三角形和圆,那么面积最大的是( )
A.长方形 | B.正方形 | C.正三角形 | D.圆 |
更新时间:2022-04-09 21:26:50
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【推荐1】如图l,在
中,
,
,
分别是边
,
上的动点,且
,
是
的中点,连接
,
,
,设
,
的面积为
,图2是
关于
的函数图象,则下列说法不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5eb7f052fe50daeaecb6acf0bf80006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/3deb2b1c-f86e-4f13-a77d-2061cf3a99e8.png?resizew=338)
A.![]() | B.![]() |
C.![]() | D.四边形![]() |
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【推荐2】如图,锐角
中,
于
,
,
,
是
边上的动点,作矩形
,使
在
边上,
在
边上,则矩形
的对角线的最小值是( )
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075451966201856/2075578706165760/STEM/89d14742c307447095186a2b96544775.png?resizew=115)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad63ab71efa010821650ffe08bd907f7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c7c5675d8c687200645270dbfba9083.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
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A.4 | B.4.8 | C.5 | D.5.5 |
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【推荐1】如图,正方形ABCD中,点E、F分别在BC、CD上,△AEF是等边三角形,连接AC交EF于G,下列结论:①BE=DF; ②∠DAF=15°, ③AC垂直平分EF, ④BE+DF=EF, ⑤EF=2CG,其中正确结论有( )个.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/36eee706-858e-45de-8a5e-c64c00042467.png?resizew=153)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/36eee706-858e-45de-8a5e-c64c00042467.png?resizew=153)
A.5 | B.4 | C.3 | D.2 |
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【推荐2】如图,在正方形
的外侧作等边
,连接
交
于点
,交
于点
,连结
并延长交
于点
,下列结论:①
;②
;③
;④
.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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A.①②③ | B.①②③④ | C.①③④ | D.①②④ |
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【推荐1】在锐角等腰△ABC中,AB=AC,
,则cosC的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac28300251806a2f96c7bbd442eda1.png)
A.![]() | B.2 | C.![]() | D.![]() |
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【推荐2】在△ABC中
,
,
,则△ABC的面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e81eecf2260511af93b3ac1a67338b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77995da977330ebbb1b05a6d461403fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f98e9c9cbdad60f42c7be2e38a07915.png)
A.![]() | B.12 | C.14 | D.21 |
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