正多边形 Circum Triangle

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=23&page=show_problem&problem=2127 [PDF](https://uva.onlinejudge.org/external/111/p11186.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11186/30fb94df57c3e66a9060a624e8f6e91fb0768a7b.png)

输入输出格式

输入格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11186/64d1ebc2f77930f60130385601410efb159e818e.png)

输出格式


![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11186/95d1f79f22d34d326141e488991cddfd8fc92eb8.png)

输入输出样例

输入样例 #1

5 10
10.00
100.00
300.00
310.00
320.00
3 20
10.00
100.00
300.00
0 0

输出样例 #1

286
320