如图
,以O为圆心,
为半径作弧,分别交
,
于点C,D,再分别以C,D为圆心
长为半径作弧,两弧交于点E,连接
,则
的长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
更新时间:2024-05-26 01:24:11
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【推荐1】如图,在
中,
,
,
,以点
为圆心,以适当长为半径作弧,分别交
、
于点
、
,再分别以
、
为圆心,以大于
的长为半径作弧,两弧在
内部交于点
,作射线
交
于点
,点
在
上且
,连接
,则
的周长为_______________________ .
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【推荐2】如图,在
中,
,
,以AB为直径作半
.按以下步骤操作:以点A为圆心,以适当的长为半径画弧,分别交AB,AC于点M,N,再分别以M,N为圆心,大于
长为半径画弧,两弧交于点P,作射线AP交半
于点D,交CB于点E,则CE、DE、
所围成的阴影部分的周长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐1】如图,
中,
,
,
,以斜边
的中点P为旋转中心,把这个三角形按逆时针方向旋转
得到
,则旋转后两个直角三角形重叠部分的面积为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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【推荐2】折纸能够制作广泛的几何图形,解决数学问题.下面是解决某个数学问题的折纸过程:(1)长方形纸片
沿某直线折叠,使点
与点
重合,折痕交
于点
;(2)展开后,沿过点
的直线
折叠,使点
落在
边上点
处.连结
,用量角器测得
,则长方形纸片中
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】如图,OP=1,过P作PP1⊥OP且PP1=1,得OP1=
;再过P1作P1P2⊥OP1且P1P2=1,得OP2=
;又过P2作P2P3⊥OP2且P2P3=1,得OP3=2…依此法继续作下去,得
=____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐2】如图,四边形ABCD是矩形,AB=2,BC=4,以BC为一边,在BC上方作等边三角形BCE,连接DE,BD则
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【推荐1】如图,平行四边形ABCD的两条对角线AC、BD相交于点O,AB= 5 ,AC=6,DB=8则四边形ABCD是的周长为_______________ .
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【推荐2】如图,两张等宽的纸条交叉重叠在一起,重叠的部分为四边形
,若测得
之间的距离为
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