如图,AB是⊙O的直径,弦CD⊥AB,∠COB=60°,CO=2,则阴影部分的面积为( )
![](https://img.xkw.com/dksih/QBM/2021/12/23/2878939532378112/2882881195507712/STEM/cd1065bd-5ca4-4a11-ad6b-c5fbdcaa113d.png?resizew=189)
![](https://img.xkw.com/dksih/QBM/2021/12/23/2878939532378112/2882881195507712/STEM/cd1065bd-5ca4-4a11-ad6b-c5fbdcaa113d.png?resizew=189)
A.![]() | B.π | C.![]() | D.2π |
更新时间:2021-12-30 20:42:08
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【推荐1】在截面为半圆形的水槽内装有一些水,如图.水面宽AB为6分米,如果再注入一些水后,水面AB上升1分米,水面宽变为8分米,则该水槽截面直径为( )
![](https://img.xkw.com/dksih/QBM/2014/11/20/1573757813948416/1573757819322368/STEM/5fc93b7e743d4298b285fa25fef92360.png)
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A.5分米 | B.6分米 | C.8分米 | D.10分米 |
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【推荐2】如图,
是
的弦,直径
于点
,下列结论不正确的是()
![](https://img.xkw.com/dksih/QBM/2018/9/22/2037879954530304/2084445638221824/STEM/2af30101951e455b8cbe6fc814520522.png?resizew=86)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,
,
,以
为直径作半圆,圆心为点
;以点
为圆心,
为半径作
,过点
作
的平行线交两弧于点
、
,则图中阴影部分的面积是( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】钟面上的分针长为2cm,从8点到8点40,分针在钟面上扫过的面积是( )cm2.
A.![]() | B.![]() | C.![]() | D.![]() |
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