如图,两个圆都以
为圆心,大圆的弦
与小圆相切于点
,若
,则圆环的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/1ce3505f-e467-40ca-a4d0-3b7e4e21758c.png?resizew=133)
更新时间:2019-10-12 15:51:03
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【推荐1】 如图,一人口的弧形台阶,从上往下看是一组同心圆被一条直线所截得的一组圆弧.已知每个台阶宽度为32cm(即相邻两弧半径相差32cm),测得AB=200cm,AC=BD=40cm,则弧AB所在的圆的半径为_______________ cm
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/112cc90a-397a-4e65-bc1c-81de4bc29e82.png?resizew=158)
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【推荐2】如图,
是边长为
的正三角形
的内切圆,
与边
、
均相切,且与
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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