在希腊数学家海伦的著作《测地术》中记载了著名的海伦公式,利用三角形的三条边长求三角形面积,若三角形的三边长为
,
,
,其面积
,这里
.已知在
中,
,
,其面积取最大值时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b9a53e552116848849b76dab92d0ac.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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更新时间:2017-05-10 15:38:38
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解题方法
【推荐1】
中,内角A,B,C的对边分别为a,b,c,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
________ ,
的面积是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】设
是直线
上一点,
是圆
:上不同的两点,若圆心
为△
的重心,则△
面积的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c966320d637cab491c67425ef1338966.png)
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解题方法
【推荐1】在棱长为
的正方体
中,
为
的中点,则异面直线
与
所成角的大小为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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【推荐2】
的内角
的对边分别为
,已知
,
,若
为
所在平面内一点,且
在直线
的异侧,
,则四边形
面积的取值范围是__________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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