作品说明
画三角形
感谢zhidao.baidu.com/question/569988621841168724.html的圆心角坐标
感谢mp.weixin.qq.com/s?__biz=MzIyNzUxMjE1Mw==&mid=2247516642&idx=3&sn=2d7dd05dfd2d902cee7b49f122e44781&chksm=e862dbd4df1552c29b2baf5fad9242e564dd1d4083bf02b28e8339294ca394ed980da08abae1&scene=27的海伦公式讲解
感谢https://aerfaying.com/Projects/457546的整体思路(没有a营账号的屑水只能看简介啊啊啊嚎啕大哭)