Parallelogram law

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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Notion

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Science and technology

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What Wikipedia says

In mathematics, the simplest form of the parallelogram law (also called the parallelogram identity) belongs to elementary geometry. It states that the sum of the squares of the lengths of the four sides of a parallelogram equals the sum of the squares of the lengths of the two diagonals.

Excerpt from the Wikipedia article “Parallelogram law”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Oleg Alexandrov, Public domain, via Wikimedia Commons.