Problem 652: Archimedes' Book of Lemmas: Proposition 12 - Circle, Tangent, Perpendicular

Online Geometry

If AB be the diameter of a semicircle, and CD, CE the tangents to it from any point C, and if AE, BD be joined meeting in F, then CF is perpendicular to AB.

  

Archimedes' Book of Lemmas: Proposition 12 Semicircle, Tangent, Perpendicular
 
 

See also:
Etching and Typography of Proposition 12

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