UVA11186 正多边形 Circum Triangle

Description

[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)

Input Format

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Output Format

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