如图,以
为圆心的圆与直线
相交于
,
两点,若
恰为等边三角形,则弧
的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501a6d50c937729c8d0f02b2b62a0ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/11/17/2594896886308864/2608192491053056/STEM/49866d4b-8921-4b89-a999-e90d1172bdb0.png)
更新时间:2020-12-11 09:36:37
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【推荐1】如图,直线y=
x,点A1坐标为(1,0),过点A1作x轴的垂线交直线于点B1,以原点O为圆心,OB1长为半径画弧交x轴于点A2;再过点A2作x轴的垂线交直线于点B2,以原点O为圆心,OB2长为半径画弧交x轴于点A3,..按此做法进行下去,点A4的坐标为_____ ,点An的坐标为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】在平面直角坐标系
中,
中,点
,若随
变化的一族平行直线
与
(包括边界)相交,则
的取值范围是______ .
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【推荐1】如图,半径为
,圆心角为
的扇形
的弧
上有一运动的点
,从点
向半径
引垂线
交
于点
,设
的内角平分线交于点
,但点
在弧
上从点
运动到点
时,则点
所经过的路径长为_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0468237bbc0d3df77435d98b817c10c0.png)
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【推荐2】如图,在平面直角坐标系中,四边形ABOC是正方形,点A的坐标为(1,1),弧AA1是以点B为圆心,BA为半径的圆弧;弧A1A2是以点O为圆心,OA1为半径的圆弧;弧A2A3是以点C为圆心,CA2为半径的圆弧;弧A3A4是以点A为圆心,AA3为半径的圆弧,继续以点B,O,C,A为圆心,按上述作法得到的曲线AA1A2A3A4A5…,称为正方形的“渐开线”,则弧A2019A2020的长是____ .
![](https://img.xkw.com/dksih/QBM/2020/12/29/2624636885147648/2624877231251456/STEM/cba65fbec97643ba825666f586e57926.png?resizew=165)
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【推荐1】将一副三角尺(在Rt△ABC中,∠ACB=90°,∠B=60°;在Rt△EDF中,∠EDF=90°,∠E=45°)如图摆放,点D为AB的中点,DE交AC于点P,DF经过点C.将△EDF绕点D顺时针方向旋转角
,
交AC于点M,
交BC于点N,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1558b64bcfa578b6b5f251f62b0489b0.png)
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【推荐2】如图,在△ABC中,
,∠BAC=120°,将△ABC绕点A按逆时针方向旋转90°,得到△AEF,连接BE,FC并分别延长交于点M,则BM的长为______ .
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