我国南宋时期杰出数学家秦九韶在《数书九章》中提出了“三斜求积术”,即以小斜幂,并大斜幂,减中斜幂,余半之,自乘于上;以小斜幂乘大斜幂,减上,余四约之,为实;一为从隅,开平方得积,把以上文字写出公式,即
(其中
为三角形面积,a,b,c为三角形的三边). 在非直角
中,a,b,c为内角A,B,C所对应的三边,若
且
,则
面积的最大值是________ ,此时
外接圆的半径为____
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更新时间:2022-06-23 11:11:02
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【推荐1】
中,
且
,则
外接圆的半径是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
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【推荐2】在
中,
、
、
分别为角
、
、
的对边,
,
,
,则该三角形内切圆半径与外接圆半径的积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知△ABC的三个角A,B,C的对边分别为a,b,c,满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3083d8997e618ae8f0463c445d4f372a.png)
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【推荐2】在
中,三内角
对应的边分别为
,且
,
,设
是边
上的高,则
的最大值为__________ .
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【推荐1】在
中,角
,
,
的对边分别是
,
,
,已知
,且
的面积为
,
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知钝角
的面积为
,
,
,则该三角形的外接圆半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐1】为了给市民提供健身场所,某市因地制宜计划在-一个圆形的区域内修建一个如图所示的内接四边形健身步道
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,
,则
的最小值为___________ ;若
,则
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87f3d9e79f0012fdb592df7dd2a8353.png)
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【推荐2】如图,为计算湖泊岸边两景点
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和
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与
之间的距离为______
(精确到
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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