钝角三角形
的面积是
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
A.![]() ![]() | B.![]() ![]() | C.![]() | D.![]() |
更新时间:2023-04-18 06:22:51
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【推荐1】在三棱锥P-ABC中,
,△PAB,△PAC,△PBC的面积分别记为
,且
,则此三棱锥的内切球的半径为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4b11c66327f895eded2871b407d206.png)
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【推荐2】如图,在
中,
为
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,若
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,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bbaa015aaabca9398529b8d3530e389.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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A.![]() | B.![]() | C.4 | D.![]() |
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【推荐1】已知在
中,角
所对的边分别为
.内角
为等差数列,若
边上的中线长为
,且
的面积为
,则
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐2】甲船在岛B的正南A处,AB=10km,甲船以每小时4km的速度向正北航行,同时,乙船自B出发以每小时6km的速度向北偏东
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