The Book of Lemmas Proposition 2 - Maple Help
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The Book of Lemmas: Proposition 2

Main Concept

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 is drawn perpendicular to AB, and if AC, DE meet in F, then DF = FE.


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position of D

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