1 . 若一个圆台的侧面展开图是半圆面所在的扇环,且扇环的面积为
,圆台上、下底面圆的半径分别为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf41895171aef7b0ffb0fda557ddbf7.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89518ac9b1efb846899a3db00aab6a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec0bbac275f84ed2f4eba6a3a780363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf41895171aef7b0ffb0fda557ddbf7.png)
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2 . 已知圆台的上、下底面中心分别为
,
,过直线
的截面是上、下底边边长分别为2和4,且高为
的等腰梯形,则该圆台的侧面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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