在等边三角形ABC中,D,E分别是AC,BC上的点,AE与BD相交于点P.若△BCD的面积是12
,BE=6,∠APB=120°,则△ABP的外接圆的半径长为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571302006513664/2573715848716288/STEM/70dab760a8ac40d98da8bc31254ac239.png?resizew=159)
2020九年级·陕西·学业考试 查看更多[2]
更新时间:2020-10-18 16:21:12
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【推荐1】如图,在正方形
中,点
,
分别在边
,
上,且
,
交
于点
,
交
于点
,
.则:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ae1f342d-70dd-48cb-80d4-2159588d0b8e.png?resizew=139)
(1)
的值为_________ .
(2)若
是
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a128bc01e17049e81a6fde450186a8.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ae1f342d-70dd-48cb-80d4-2159588d0b8e.png?resizew=139)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ca7f165f675f538ac4fcb5ac5cf538.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a128bc01e17049e81a6fde450186a8.png)
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【推荐2】如图,正三角形
的边长为a,点E是
边上的动点(不与端点A、B重合),在
上方作正三角形
.当点E由点B向点A运动过程中,①
;②四边形
的面积随着点E从点B向点A方向的运动而逐渐变大;③若点G为
的中点,则
的最小值为
;④
面积的最小值为
.其中正确的是_____________ .(写出所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97075fe3c2a105f5d2d0a27a9f2b3410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31907a101de6e470922d21d2d4a7e93.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2f8382467df835a516233c58665ba74.png)
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【推荐1】如图,点
为正方形
边
上一点,连接
,将
绕点
逆时针方向旋转
得到
,点
对应点为
,点
对应点为G,
交
于点
,连接
.下列结论:①
;②
;③当点E与点
重合时
;④当点
落在
边上时,
;⑤当
最短时,
.其中正确的是______ (填写序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260200d547998bcac50a4a491382e7f4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7d52651b5155ea10c2cb6f89f15059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc72e22c2c9701c1ec79c4a1c10951c.png)
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【推荐2】如图,在菱形ABCD中,∠DAB=60°,AB=3,点E在边AD上,且DE=1,点F为线段AB上一动点(不与点A重合),将菱形沿直线EF折叠,点A的对应点为点A′,当点A′落在菱形的对角线上时,AF的长为___ .
![](https://img.xkw.com/dksih/QBM/2021/5/14/2720615862558720/2729283698548736/STEM/de9c615d074a400295a418767685fd59.png?resizew=228)
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【推荐1】如图,在△ABC中,∠C=45°,∠B=60°,BC为
+1,点P为边AB上一动点,过点P作PD⊥BC于点D,PE⊥AC于点E,则DE的最小值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/62b05af5-960f-4166-ab58-1324b87914ab.png?resizew=184)
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【推荐2】如图,在Rt△ABC中,∠ABC=90°.AB=BC.点D是线段AB上的一点,连结CD.过点B作BG⊥CD,分别交CD、CA于点E、F,与过点A且垂直于AB的直线相交于点G,连结DF,给出以下四个结论:①
;②若点D是AB的中点,则AF=
AB;③当B、C、F、D四点在同一个圆上时,DF=DB;④若
,则S△ABC=9S△BDF,其中正确的结论序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37805c479cad556c8687f9a81d1e8aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d74ef32584586ec4857acd0a3f4fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a8bc98b678f5ef06502fe834a94006.png)
![](https://img.xkw.com/dksih/QBM/2020/1/11/2381245916610560/2433484171223042/STEM/09f61c7a89184774aa259b6ef9b94954.png?resizew=136)
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【推荐1】在平面直角坐标系中,A(-1,0),B(2,0),∠OCB=30°,D为线段BC的中点,线段AD交线段OC于点E,则△AOE面积的最大值为___________
![](https://img.xkw.com/dksih/QBM/2021/12/15/2873218790211584/2879334309347328/STEM/1a9591eb-a8a5-4580-b936-a1cadfe2aafd.png?resizew=249)
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【推荐2】如图,在矩形
中,点
为
的中点,
交
于点
,连接
,下列结论:
①
;
②
;
③
;
④若
,则
.
其中正确的结论是______________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0133c119bdff050752f8912a4ace330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1a2d4bb1773b61cd1284360202a03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/885767d3-36c9-4e1d-8c3e-64a1186adfd8.png?resizew=107)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/003c5d60601f1e025dcc9f03ffdd42b6.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79d7aac43eb3348ea16d87aab80a34b.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a261f8fcc0c677ff79eb3dfb3e5e6b15.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7a89784678235341d88f15dc1ecde0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ac50dfc29f8e127a64c66d1bc88637.png)
其中正确的结论是
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