已知,RtΔABC中,∠C=90°,∠ABC=30°,BC=3,那么AC=________________ .
19-20八年级上·上海黄浦·期中 查看更多[2]
更新时间:2019-11-25 15:42:11
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【推荐1】如图,将
绕点
按顺时针旋转一定角度得到
,点
的对应点
恰好落在
边上.
(1)
是等腰三角形吗?_____________ (选填“是”或“否”);
(2)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
_____________ .
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a00fb03e0f4b922e1d114a1ab02b24.png)
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【推荐2】如图,
是等边三角形,
是等腰三角形,且
,
,点
为直线
上一点,
,将
绕点
按逆时针方向旋转一周,当
时,请直接写出
的长__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】青朱出入图,是魏晋时期数学家刘徽根据“割补术”运用数形关系证明勾股定理的几何证明法,即“勾自乘为朱方,股自乘为青方,令出入相补,各从其类,因就其余不动也,合成弦方之幂,开方除之,即弦也”,若图中
,
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的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70abed7faf55deb24162255c5ad59577.png)
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【推荐2】如图,在矩形
中,
是
的中点,连接
,将
沿着
翻折得到
,
交
于点
,延长
,
相交于点
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3943224ebad9517a0611e0a0b039952.png)
________ .
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