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.
See also:
Etching and Typography of Proposition 12
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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