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[几何] 假设钉板无限大,能不能围出正三角形

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baxiannv posted 2022-5-23 14:09 |Read mode
Last edited by hbghlyj 2025-3-9 05:59True or False?

It is possible to create an equilateral triangle on the pegboard below.

Explanation
Correct answer: False

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kuing posted 2022-5-23 14:25
更一般结论见《撸题集》P.981~982 题目 6.10.61

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original poster baxiannv posted 2022-5-23 14:35
kuing 发表于 2022-5-23 14:25
更一般结论见《撸题集》P.981~982 题目 6.10.61
能发个链接吗

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kuing posted 2022-5-23 14:42
置顶帖有,2015那个。

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original poster baxiannv posted 2022-5-23 14:43
kuing 发表于 2022-5-23 14:42
置顶帖有,2015那个。
【潜水】河北已毕业)  14:38:00
正三角形面积为 sqrt(3)/4 * a^2吧

【潜水】河北已毕业)  14:38:21
那a^2要是无理数才行吧

【潜水】河北已毕业)  14:38:45
但是格点时、a^2必定是整数


可以这么证明吗

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Czhang271828 posted 2022-5-23 21:38
baxiannv 发表于 2022-5-23 14:43
【潜水】河北已毕业)  14:38:00
正三角形面积为 sqrt(3)/4 * a^2吧

这显然对啊
无钱佮歹看、无样佮歹生、无汉草佮无文采、无学历佮无能力、无高度无速度无力度共闲无代志。(闽南话)
口号:疼惜生命,远离内卷。

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