Viviani's theorem

Rarity: Uncommon

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

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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Notion

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Science and technology

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What Wikipedia says

Viviani's theorem, named after Vincenzo Viviani, states that the sum of the shortest distances from any interior point to the sides of an equilateral triangle equals the length of the triangle's altitude.

Excerpt from the Wikipedia article “Viviani's theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Krishnavedala, CC0, via Wikimedia Commons.