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.
Adjust the slider, or drag on the plot to change the position of the point D
position of D
More MathApps
MathApps/AlgebraAndGeometry
Download Help Document
