如图,正方形ABCD中,连接BD,点E在边BC上,且CE=2BE,连接AE交BD于F;连接DE,取BD的中点O;取DE的中点G,连接OG,下列结论:
①BF=OF;②OG⊥CD;③AB=5OG;④sin∠AFD=
;⑤
.
其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2014/1/22/1573701621465088/1573701626683392/STEM/f4890ba60bc2430aba2698b9894409ac.png?resizew=136)
①BF=OF;②OG⊥CD;③AB=5OG;④sin∠AFD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f7210fa38aeee121e50a01a00a28b1.png)
其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2014/1/22/1573701621465088/1573701626683392/STEM/f4890ba60bc2430aba2698b9894409ac.png?resizew=136)
A.5 | B.4 | C.3 | D.2 |
12-13九年级上·重庆·期末 查看更多[2]
更新时间:2014-01-22 20:34:03
|
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【推荐1】如图,在菱形
中,对角线
与
相交于点O,
,点E,F分别是
,
的中点,连接
,
,
,
分别与
,
相交于点M,N,连接
,
,下列结论:(1)
是等边三角形;(2)四边形
是菱形;(3)
;(4)
.其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在矩形
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A.![]() | B.3 | C.![]() | D.![]() |
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【推荐1】如图,四边形ABCD为正方形中,点O为对角线AC的中点,过点O作射线OG、ON分别交AB、BC于点E、F,且∠EOF=90°,BO、EF交于点P.则下列结论中:(1)图中全等的三角形只有2对;(2)ABCD的面积等于四边形OEBF面积的4倍;(3)BE+BF=2OA;(4)AE2+CF2=2OF2.正确的结论有( )个
![](https://img.xkw.com/dksih/QBM/2021/8/23/2791940593803264/2794308142940160/STEM/51c07b1f-3c01-46d7-ad45-c67c3c7d7882.png)
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【推荐2】如图,在边长为3的正方形
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于点M,则
的长为( )
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真题
解题方法
【推荐1】如图,以M(﹣5,0)为圆心、4为半径的圆与x轴交于A、B两点,P是⊙M上异于A、B的一动点,直线PA、PB分别交y轴于C、D,以CD为直径的⊙N与x轴交于E、F,则EF的长 ( )
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【推荐2】如图,在Rt△ABC中,∠BAC=90°,BA=CA=6
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处,
与AB交于点F,连接
.当
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在矩形ABCD中,AB=12,P是边AB上一点,把△PBC沿直线PC折叠,得到△PGC,边CG交AD于点E,连接BE,∠BEC=90°,BE交PC于点F,那么下列选项正确的有( )
①BP=BF;②若点E是AD的中点,则△AEB≌△DEC;③当AD=25,且AE<DE时,则DE=16;④当AD=25,可得sin∠PCB=
;⑤当BP=9时,BE•EF=108.
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699397331795968/2700366543806464/STEM/f156f85580cc4d9b9119f174b1dfc098.png?resizew=341)
①BP=BF;②若点E是AD的中点,则△AEB≌△DEC;③当AD=25,且AE<DE时,则DE=16;④当AD=25,可得sin∠PCB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69d166677557cadb3da32b4a7e152e3.png)
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699397331795968/2700366543806464/STEM/f156f85580cc4d9b9119f174b1dfc098.png?resizew=341)
A.5个 | B.4个 | C.3个 | D.2个 |
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【推荐2】如图将矩形纸片
折叠,使点
落在边
上的
处,折痕为
,过
作
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于点
.连接
.已知
,有下列结论:①
;②
;③四边形
为菱形;③
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A.![]() | B.![]() | C.![]() | D.![]() |
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