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Proposition: 3.17: Construction of Tangent from Point to Circle

(Proposition 17 from Book 3 of Euclid's “Elements”)

To draw a straight line touching a given circle from a given point.

fig17e

Modern Formulation

It is possible to construct a tangent to a given circle.

Proofs: 1

Proofs: 1
Sections: 2


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Github:
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non-Github:
@Fitzpatrick


References

Adapted from (subject to copyright, with kind permission)

  1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Adapted from CC BY-SA 3.0 Sources:

  1. Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016