如图,在正方形ABCD中,以BC为直径作半圆O,以D为圆心,DA为半径作
,与半圆O交于点P,我们称:点P为正方形ABCD的一个“奇妙点”,过奇妙点的多条线段与正方形ABCD无论是位置关系还是数量关系,都具有不少优美的性质值得探究.连接PA、PB、PC、PD,并延长PD交AB于点F.下列结论中:①FD=FB+BC;②∠APC=135°;③S△PBC=
AP2;④tan∠BAP=
;其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731616141066240/2784845605904384/STEM/dc25743d1cf645b7a8450d439eec48dc.png?resizew=141)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731616141066240/2784845605904384/STEM/dc25743d1cf645b7a8450d439eec48dc.png?resizew=141)
A.4个 | B.3个 | C.2个 | D.1个 |
2021·广东深圳·一模 查看更多[2]
更新时间:2021-08-16 14:17:15
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【推荐1】如图,在
中,
,
,
内切圆
半径为
,将
绕点C逆时针方向旋转60°得
,连接
交
于点M,则点M到
与点M到
的距离之比为( )
![](https://img.xkw.com/dksih/QBM/2023/2/14/3174731393015808/3178311135133696/STEM/35b89dfdd7d94fd7a0f52a9fee2f9144.png?resizew=171)
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【推荐2】如图,在
中,
,
,
的内切圆
与边
相切于点
,过点
作
交
于点
,过点
作
的切线交
于点
,则
的值等于( )
![](https://img.xkw.com/dksih/QBM/2018/11/9/2072060152111104/2074884509024256/STEM/e4ff9ed56d3148ca80a238c942d1a8ac.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐1】如图,已知菱形
的边长为4,对角线
相交于点O,点
分别是边
上的动点,
,连接
,
与
相交于点E.以下四个结论:①
点是等边三角形;②
的最小值是
;③若
时,
;④当
时,
.其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/fcf83d26-2f4b-4dd6-9248-16ca050b455e.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.1个 | B.2个 | C.3个 | D.4 |
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【推荐2】拿破仑为人好学,是法兰西科学院院士,他对数学方面很感兴趣,在行军打仗的空闲时间,经常研究平面几何.他提出了著名的拿破仑定理:以三角形各边为边分别向外侧作等边三角形,则它们的中心构成一个等边三角形.如图所示,以
的三条边为边,分别向外作三个正三角形,顺次连结它们的中心E,F,G,得到“拿破仑
”.已知三个等边三角形的面积比为
,则“拿破仑
”与
的面积比为( )
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748541982048256/2748624556949504/STEM/24ee33c6-8d6e-4179-8370-1cf8b678a487.png)
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