已知正方形的两个顶点坐标(注意不是相邻的两个)，怎么求另两个

P1665 正方形计数

~~btd,jbl?~~
by WanderingTrader @ 2020-06-06 13:28:00

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@[wangyutao](/user/29752) 设两个为$(x_1,y_1)and(x_2,y_2)$，则另两个为$(x_1,y_2)and(x_2,y_1)$？
by WanderingTrader @ 2020-06-06 13:29:43

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~~勾股定理~~
by Blunt_Feeling @ 2020-06-06 13:30:22

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$$((x_1+x_2)/2+(y_1-y_2)/2,(y_1+y_2)/2+(x_2-x_1)/2)$$ $$((x_1+x_2)/2+(y_2-y_1)/2,(y_1+y_2)/2+(x_1-x_2)/2)$$
by 123456zmy @ 2020-06-06 13:30:46

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orz
by Sarcasm @ 2020-06-06 13:34:19

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