名校
1 . 圆台侧面的母线长为
,母线与轴的夹角为
,一个底面的半径是另一个底面半径的
倍.则两底面的面积之和是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da971671378e8d40e15f5ef0b6e41467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
2 . 若一个圆台的母线长为l,上、下底面半径
,
满足
,且圆台的侧面积为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78cd2ff6af1dc21dc774bd2fa030ad66.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1028e94386dd1eacd96310edacf20509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8877c38d15fb2c20245cdf348987258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ccafc20b51107cd4c2c8a2170a1c0ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27fd79572bbb49f102c6ff3740cb2124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78cd2ff6af1dc21dc774bd2fa030ad66.png)
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