如图,在
中,
,分别以
为直径作半圆围成两月牙形(图中阴影部分),过点C作
分别交三个半圆于点D,E,F.则下列说法一定正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d07f64e80b0350f7fb55f163ebbe9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cad97dd9d9593fa01342550aba6ec47.png)
A.四边形![]() | B.![]() |
C. ![]() | D.两月牙形的面积等于四边形![]() ![]() |
更新时间:2024-05-23 15:25:04
|
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【推荐1】二次函数y=ax2+bx+c(a>0)的顶点为P,其图像与x轴有两个交点A(﹣m,0),B(1,0),交y轴于点C(0,﹣3am+6a),以下说法中正确的是( )
A.m=3 |
B.当∠APB=120°时,a=![]() |
C.当∠APB=120°时,抛物线上存在点M(M与P不重合),使得△ABM是顶角为120°的等腰三角形 |
D.抛物线上存在点N,当△ABN为直角三角形时,有a≥ ![]() |
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【推荐2】如图,正方形ABCD边长为1,以AB为直径作半圆,点P是CD中点,BP与半圆交于点Q,连接DQ.下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/2/26/2924639083413504/2937926800850944/STEM/1c1c1811e3d84f5cbea0f59824b33c0c.png?resizew=168)
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A.DQ=1 | B.![]() | C.S△PDQ=![]() | D.cos∠ADQ=![]() |
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【推荐1】如图,在边长为4的正方形ABCD中,E、F是AD边上的两个动点,且AE=FD,连接BE、CF、BD,CF与BD交于点G,连接AG交BE于点H,连接DH,下列结论中正确的是( )
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A.△ABG∽△FDG | B.HD平分∠EHG | C.AG⊥BE |
D.S△HDG:S△HBG=tan∠DAG | E.线段DH的最小值是2![]() |
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【推荐2】如图,在⊙O中,AB是⊙O的直径,点D是⊙O上一点,点C是弧AD的中点,弦CE⊥AB于点F,过点D的切线交EC的延长线于点G,连接AD,分别交CF、BC于点P、Q,连接AC.则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/1eddd120-10b5-48ff-8b53-ccf47fa1ae7b.png?resizew=135)
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A.∠BAD=∠ABC | B.GP=GD | C.点P是△ACQ的外心 | D.AP•AD=CQ•CB |
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【推荐1】图,
为正方形
边
上一动点(不与
重合),
,将
绕点
逆时针旋转
得到
,再将
沿直线
折叠得到
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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A.连接![]() ![]() |
B.连接![]() ![]() ![]() ![]() ![]() |
C.连接![]() ![]() ![]() ![]() ![]() |
D.连接![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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【推荐2】如图,正方形
边长为2,在正方形
内部,以
为直径作半圆,点
是
中点,
分别与半圆交于点
,点
,连接
.下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.![]() | B.![]() |
C.![]() | D.点![]() |
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