Put the point of your compass at (E) and extend it along the diagonal (EK) to point (m) where the circle intersects (EK), and draw the arc downward to intersect (KD f C) at (n).
If (EK) = (5), and (l m/l D) and l i = .5, the diameter of this circle is 1.
This makes (E m) = .618 + 1, or 1.618.
(E m) is the apothem.
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