如图所示,△ABC的三边AB,BC,CA长分别是60, 70,80,其三条角平分线将△ABC分为三个三角形,则
等于_____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da238e0c706d190497ad948898b85bb6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/2110bde9-87c4-467c-8a58-27444104bb05.png?resizew=144)
更新时间:2022-08-28 08:00:10
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【推荐2】如图,已知直线
分别交x轴,y轴于A,B两点,将线段AB平移至CD的位置,使点D落在x轴的负半轴上,点C在反比例函数
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【推荐1】如图,在平面直角坐标系中,点
是
轴正半轴上一定点,利用尺规按以下步骤作图.
(1)以点
为圆心,
长度为半径作弧交
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,分别以点
,
为圆心,大于
的长为半径作弧,两弧交第一象限于点
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;
以点
为圆心,
长度为半径作弧交
轴于另外一点
点
不与点
重合
,分别以点
、
为圆心,大于
的长为半径作弧,两弧交于点
,
,作直线
交射线
于点
,若点
的坐标为
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的值为________ .
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(1)以点
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【推荐2】如图,已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6149959d41415c9d9c3fbccc5566f297.png)
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