Talk:Liu Xin (scholar)

Astronomy Low‑importance

	Astronomy portal This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy articles
Low	This article has been rated as Low-importance on the project's importance scale.

Biography: Science and Academia

	Biography portal This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography articles
	This article is supported by the science and academia work group.

China Mid‑importance

	China portal This article is within the scope of WikiProject China, a collaborative effort to improve the coverage of China related articles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ChinaWikipedia:WikiProject ChinaTemplate:WikiProject ChinaChina-related articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Pi[edit]

A taiwanese source transmits us the following interpretation of the text: there are apparently 10 inches to a chinese foot, so diameter is sqrt(50)+0.095, where 0.095 inches is the gap between the corner of the square and the circle. Assuming the area is 162 inches, the pi comes out to be 3.1547 --- close but not nearly as good as Archimedes three hundred years earlier with his 22/7 < pi< 223/71. See here: http://episte.math.ntu.edu.tw/articles/mm/mm_03_2_08/page2.html Kotika98 (talk) 03:22, 5 May 2014 (UTC)[reply]

This seems to imply the formula

\pi ={\frac {A}{r^{2}}}={\frac {162}{({\sqrt {5}}0+0.095)^{2}}}

, though diameter and radius appear to be confused and the area should be in square inches. Checking with a calculator I see 162÷(√50+0.095)² ≈ 3.154664564 PJTraill (talk) 15:32, 6 August 2018 (UTC)[reply]

External links modified[edit]

Hello fellow Wikipedians,

I have just modified one external link on Liu Xin. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://archive.is/20070929095549/http://203.72.198.245/web/Content.asp?ID=56928&Query=1 to http://203.72.198.245/web/Content.asp?ID=56928&Query=1

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 22:39, 15 December 2017 (UTC)[reply]

Did he calculate π or just measure?[edit]

Could it be that Liu Xin used no mathematical theory but gave figures based on measurement? If this doubt can be scattered, it would be good to mention it, along with the reasoning, in the section #pi. PJTraill (talk) 13:04, 6 August 2018 (UTC)[reply]