Question 26
In the figure, $\overline{AB}$ and $\overline{CD}$ are diameters of the circle with center $O,$ $\overline{AB}\perp\overline{CD},$ and chord $\overline{DF}$ intersects $\overline{AB}$ at $E.$ If $DE=6$ and $EF=2,$ then the area of the circle is
