如图,∠DAC=∠ADC=22.5°,DC∥AB,DE⊥AB于E,若AC=4,则DE的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/2da7a050-a184-452e-97a8-271b95d692d9.png?resizew=265)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/23/2da7a050-a184-452e-97a8-271b95d692d9.png?resizew=265)
A.2 | B.![]() | C.4 | D.![]() |
更新时间:2022-07-20 21:44:28
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【推荐1】如图,将一张三角形纸片
的一角折叠,使点
落在
处的
处,折痕为
.如果
,
,
,那么下列式子中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bde9258da29e3517635b1c7ef239edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd85b82562377e4b78d157fb54bad21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56a958c9e7622736b147d6950db8ec9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在△ABC中,AB =AC,BD= BC,AD=DE=EB,则∠A的度数为( )
![](https://img.xkw.com/dksih/QBM/2019/12/5/2348617993060352/2349266754772993/STEM/8832887e6e6b4113890d719abc0db062.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/2019/12/5/2348617993060352/2349266754772993/STEM/8832887e6e6b4113890d719abc0db062.png?resizew=178)
A.30° | B.45° |
C.60° | D.36° |
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【推荐1】如图,Rt△ABC中,∠C=90°,利用尺规在BC,BA上分别截取BE,BD,使BE=BD;分别以D,E为圆心、以大于
的长为半径作弧,两弧在∠CBA内交于点F;作射线BF交AC于点G.若AB=10,BC=8,则点G到直线AB的距离为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/f6d65f4f-5055-4351-a5d3-17541d9768f0.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65026a6b6402cb599e14be8023a3f6a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/1/f6d65f4f-5055-4351-a5d3-17541d9768f0.png?resizew=152)
A.![]() | B.3 | C.4 | D.![]() |
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【推荐2】如图,△ABC的三边AB、AC、BC的长分别为4、6、8,其三条角平分线将△ABC分成三个三角形,则S△OAB:S△OAC:S△OBC=( )
A.2:3:4 | B.1:1:1 | C.1:2:3 | D.4:3:2 |
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【推荐1】如图,等腰直角三角形ABC,∠BAC=90°,D、E是BC上的两点,且BD=CE,过D、E作DM、EN分别垂直AB、AC,垂足为M、N,交于点F,连接AD、AE.其中①四边形AMFN是正方形;②△ABE≌△ACD;③CE2+BD2=DE2;④当∠DAE=45°时,AD2=DE•CD.正确结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/b36f89d8-30e3-499f-b699-aa2f58f98dbe.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/b36f89d8-30e3-499f-b699-aa2f58f98dbe.png?resizew=169)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,在长方形
中,
,
,点E是
边上一点,且
,点P是边
上一动点,连接
,
,则下列结论:
①
;
②当
时,
平分
;
③连接
,
周长的最小值为
;
④当
或6或
时,
为等腰三角形.
其中正确的个数有 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/5c5fb1d9-a9e4-49cb-a0b4-30e8e6fb77fa.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574dc284fb9e74d65cf0c79a978d65de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6635d52c9f756044e85bd57e4aeaae8.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574dc284fb9e74d65cf0c79a978d65de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac85c5876c03f5a87f9615d02acefd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
其中正确的个数有 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/5c5fb1d9-a9e4-49cb-a0b4-30e8e6fb77fa.png?resizew=181)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,边长为2的正方形
的对角线
与
交于点
,将正方形
沿直线
折叠,点
落在对角线
上的点
处,折痕
交
于点
,则
长是( )
![](https://img.xkw.com/dksih/QBM/2022/6/13/3000576330399744/3001309933371392/STEM/2223c7d3cbaf4db9af1c986addaa7c2f.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/2022/6/13/3000576330399744/3001309933371392/STEM/2223c7d3cbaf4db9af1c986addaa7c2f.png?resizew=161)
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【推荐2】如图,在平面直角坐标系
中,菱形
的顶点
在
轴上,边
在
轴上,若点
的坐标为
,则
点的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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