Tangent lines to circles

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In Euclidean plane geometry, a tangent line to a circle is a line that touches the circle at exactly one point, never entering the circle's interior. Tangent lines to circles form the subject of several theorems, and play an important role in many geometrical constructions and proofs.

Excerpt from the Wikipedia article “Tangent lines to circles”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Robert FERREOL, CC BY-SA 4.0, via Wikimedia Commons.