2018年USAAAO短问题第7道

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Jingsong Guo（讨论 | 贡献）2020年3月9日 (一) 18:18的版本（创建页面，内容为“==英文题目== [5 pt] On March 21st at true noon, length of the shadow of a vertical rod was equal to its height. On which geographic latitude did this happen?”）

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英文题目

[5 pt] On March 21st at true noon, length of the shadow of a vertical rod was equal to its height. On which geographic latitude did this happen?

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