如图,在半径为2
,圆心角为90°的扇形
中,
,点D是半径
的中点,点E从点D出发,沿
的方向运动到A的过程中,线段
、
与
所围成的区域(图中阴影部分)面积的最小值为____________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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2022·福建泉州·模拟预测 查看更多[3]
2022年福建省泉州市惠安县初中毕业班质量检测数学试题(已下线)专题4.5 多边形与圆的认识(能力提升)-2022-2023学年七年级数学上册《同步考点解读·专题训练》(北师大版)31-与圆有关的计算
更新时间:2022-06-07 12:29:40
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【推荐1】如图,已知点A是双曲线y=﹣
在第二象限分支上的一个动点,连接AO并延长交另一分支于点B,以AB为边作等边三角形ABC,点C在第一象限内,随着点A的运动,点C的位置也不断变化,但点C始终在双曲线y=
(k>0)上运动,则k的值是______ .
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【推荐2】如图,四边形ABCD为正方形,点E在CB的延长线上,AF平分∠DAE交DC的延长线于点F,若BE=8,CF=9,则CD的长为______ .
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421368893440000/2421735065985024/STEM/0f25d97f37284827b234b38df158eb70.png?resizew=165)
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【推荐1】如图,
为半圆弧
的中点,
为弧
上任意一点,
且与
交于点
,连接
. 若
,则
的最小值为_________
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【推荐2】如图,扇形
的半径
厘米,圆心角
,点
是
的中点,点
、
分别是半径
、
上的点,且
.
,
,则图中阴影的面积为______ 平方厘米.
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【推荐1】如图,在扇形AOB中,
,点
为半径
的中点,以点
为圆心,
的长为半径作弧
交
于点
.点
为弧
的中点,连接
.若
,则阴影部分的面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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【推荐2】如图,在矩形ABCD中,AD=6,以点C为圆心,以CB的长为半径画弧交AD于E,点E恰好是AD中点,则图中阴影部分的面积为_____ (结果保留π)
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