PUMaC 2011 · 个人决赛（B 组） · 第 1 题
PUMaC 2011 — Individual Finals (Division B) — Problem 1
题目详情
- If the plane is partitioned into a grid of congruent equilateral triangles, prove that there does not exist a square with vertices at the vertices of this grid.
解析
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Original Explanation
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