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GeometryProblem 641. Archimedes' Book of Lemmas: Proposition 2

Let AB be the diameter of a semicircle, and let the tangents to it at B and at any other point D on it meet in C. If now DE be drawn perpendicular to AB, and if AC, DE meet in F, then F is the midpoint of DE.
 

Archimedes Book of Lemmas: Semicircle, Tangent, Perpendicular
 
 


Books of Lemmas Index

Proposition 1
Proposition 2
Proposition 3
Proposition 4
Proposition 5
Proposition 6
Proposition 7
Proposition 8
Proposition 9
Proposition 10
Proposition 11
Proposition 12
Proposition 13
Proposition 14
Proposition 15

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