名校
1 . 如图所示,在
ABC中,AB=AC,A=
,记
ABC外接圆的面积为S1,取
ABC三边的中点分别为D,E,F,记
DEF外接圆的面积为S2,再取
DEF三边的中点分别为P,Q,R,记
PQR外接圆的面积为S3,...,依次类推,若
ABC的内切圆半径为
,则S3=( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/4e149b47-acd6-4962-b1a6-8a52149e6b23.png?resizew=260)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16bbdb738028b0d611262c1824563af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/4e149b47-acd6-4962-b1a6-8a52149e6b23.png?resizew=260)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-07-05更新
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154次组卷
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2卷引用:三省三校2023届高三第一次联考文科数学试题