如图,六边形
是中心对称图形.点
,
在面积为8的正方形
的对角线上.若
,点
,
关于
对称,则四边形
的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727693824901120/2728841816055808/STEM/e21eed13-c3cd-4709-ab39-781fac12b82f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafea02a73e65ff1eb2aa2a8d9b148c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0f70aca6e2719bb9df9216106a4144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c926737768d2dc7796a3d8a682ecd890.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2727693824901120/2728841816055808/STEM/e21eed13-c3cd-4709-ab39-781fac12b82f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-06-17 13:49:33
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【推荐1】如图,正方形
和正方形
边长分别为
和
,正方形
绕点
旋转,给出下列结论:①
;②
;③
;④当
时,
.其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/494312b0-67ad-4a94-9cc8-8eb6676b7985.png?resizew=221)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1596f7c0d0bab4e7e586d705d323e0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d573e81044852a4f024713f125deb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cdc9fe0241bf55e6bb607ea21cab694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5df3be4e18c4662478953781e1a6199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad0d094052baf4b083ef131e04e295c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/494312b0-67ad-4a94-9cc8-8eb6676b7985.png?resizew=221)
A.①②③ | B.②③④ | C.①②④ | D.①②③④ |
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【推荐2】如图,在正方形
中,O为对角线
的中点,E为正方形内一点,连接
,
,连接
并延长,与
的平分线交于点F,连接
,若
,则
的长度为( )
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26c2c53046cbfe83f84f5393373589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
A.2 | B.![]() | C.1 | D.![]() |
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【推荐1】对于坐标平面内的点,先将该点向右平移1个单位,再向上平移2个单位,这种点的运动称为点的斜平移,如点P(2,3)经1次斜平移后的点的坐标为(3,5).已知点A的坐标为(2,0),点Q是直线l上的一点,点A关于点Q的对称点为点B,点B关于直线l的对称点为点C,若点B由点A经n次斜平移后得到,且点C的坐标为(8,6),则△ABC的面积是( )
A.12 | B.14 | C.16 | D.18 |
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【推荐2】如图,正方形ABCD的边长为
,直线EF经过正方形的中心O,并能绕着O转动,分别交AB、CD边于E、F点,过点B作直线EF的垂线BG,垂足为点G,连接AG,则AG长的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/a6a5f6e3-b0b0-4613-9718-80f35581b8b5.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/a6a5f6e3-b0b0-4613-9718-80f35581b8b5.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,
和
是以点
为直角顶点的等腰直角三角形,把
以
为中心顺时针旋转,点
为射线
、
的交点.若
,
.以下结论:
①
;②
;
③当点
在
的延长线上时,
;
④在旋转过程中,当线段
最短时,
的面积为
.
其中正确结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/509d8dd6031dc0ef92075877e53fe201.png)
③当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93b4ece89ebdcb5929a7e2112d8a5ba.png)
④在旋转过程中,当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99c4909b2a6be11adc93158fb2230e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6bbccce1dd4b98ac9a3a20c7a1dfe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
其中正确结论有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,过原点的直线与反比例函数y=
(k>0)的图象交于A、B两点,点A在第一象限,点C在x轴正半轴上,连接AC交反比例函数图象于点D,AE为∠BAC的平分线,过点B作AE的垂线,垂足为E,连接DE,若AD=2DC,△ADE的面积为8,则k的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/3ddcfb46-4236-4509-9f7a-49b0d0ac033c.png?resizew=218)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abb3a62e46296c417261156b51ec6b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/3ddcfb46-4236-4509-9f7a-49b0d0ac033c.png?resizew=218)
A.4 | B.6 | C.8 | D.10 |
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【推荐1】由四个正方形相框拼成的照片墙如图1所示,图2是其平面几何图,其中正方形
,正方形
,正方形
的面积分别为4分米2,4分米2,16分米2,则正方形
的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/77152b83-0334-48c1-b4ca-31d9c302bfd6.png?resizew=355)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6918721b0bc5ab42cee9026c276a770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b8b2a21dbcc88f34a3e8916440a2b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/77152b83-0334-48c1-b4ca-31d9c302bfd6.png?resizew=355)
A.5分米2 | B.6分米2 | C.6.25分米2 | D.8分米2 |
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【推荐2】如图,从等边△ABC的三个顶点出发,向外分别引垂直于对边的射线,在射线上分别截取
,若
,则等边
的边长为( )
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442707005456384/2442802348908544/STEM/a81f9370-7d0f-4246-98b9-e176d681ba90.png?resizew=205)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651631acc38b1724e0377651fd9f6010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf0f8e51f43015144a6f572230c925b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442707005456384/2442802348908544/STEM/a81f9370-7d0f-4246-98b9-e176d681ba90.png?resizew=205)
A.2 | B.3 | C.![]() | D.6 |
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【推荐3】为践行“绿水青山就是金山银山”的重要思想,某森林保护区开展了寻找古树活动.如图,在一个坡度(或坡比)
=1:2.4的山坡AB上发现有一棵占树CD.测得古树底端C到山脚点A的距离AC=26米,在距山脚点A水平距离6米的点E处,测得古树顶端D的仰角∠AED=48°(古树CD与山坡AB的剖面、点E在同一平面上,古树CD与直线AE垂直),则古树CD的高度约为( )(参考数据:
°≈0.73,cos8°≈0.67,tan48°≈1.11)
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228839538737152/2229096210939904/STEM/08f4318001d24a1eaf80f01b6523a367.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a29d8e25f769ba8eec7574de1cee52.png)
![](https://img.xkw.com/dksih/QBM/2019/6/19/2228839538737152/2229096210939904/STEM/08f4318001d24a1eaf80f01b6523a367.png?resizew=123)
A.17.0米 | B.21.9米 | C.23.3米 | D.33.3米 |
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