第24届国际数学家大会会标是以我国古代数学家赵爽的弦图为基础进行设计的.如图所示,会标是由四个全等的直角三角形与一个小正方形拼成的一个大正方形.如果小正方形的面积为1,大正方形的面积为25,直角三角形中较小的锐角为
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce77dd44ad92e6a73e556f17daf1b66.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce77dd44ad92e6a73e556f17daf1b66.png)
![](https://img.xkw.com/dksih/QBM/2020/3/23/2425970227011584/2427045904285696/STEM/e2bdfce0142f45ecb2c0b3042ec0cade.png?resizew=90)
更新时间:2020-03-25 11:00:26
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【推荐1】如图,射线
和
均为笔直的公路,扇形
区域(含边界)是一蔬菜种植园,其中
,
分别在射线
和
上.经测量得,扇形
的圆心角(即
)为
,半径为1千米为了方便菜农经营,打算在扇形
区域外修建一条公路
,分别与射线
,
交于
,
两点,并要求
与扇形弧
相切于点
.设
(单位:弧度),假设所有公路的宽度均忽略不计,则公路
长度的最小值为______ 千米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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【推荐2】我国古代数学家赵爽利用“勾股圆方图"巧妙地证明了勾股定理,成就了我国古代数学的骄傲,后人称之为“赵爽弦图”.如图,它是由四个全等的直角三角形和中间的一个小正方形拼成的一个大正方形若直角三角形中较小的锐角记为
,大正方形的面积为25,小正方形的面积为1,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c2bac639dbf708c13455e9d6db26a5.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c2bac639dbf708c13455e9d6db26a5.png)
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【推荐1】设角
的终边过点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441be0280b5ce7f7face0213e84c8e2e.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe211e0dea7a44863e5e1706633c3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c32de0a15da1cb7cc8043f99f944d93.png)
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【推荐2】若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3397da9974613f3c4f9466643eebd4.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b969220886174b1a342fcd39014e4f2.png)
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