Monge's theorem

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Science and technology

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What Wikipedia says

In geometry, Monge's theorem, named after Gaspard Monge, states that for any three circles in a plane, none of which is completely inside one of the others, the intersection points of each of the three pairs of external tangent lines are collinear.

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

Image: Jason Quinn, Public domain, via Wikimedia Commons.