Enter the answer as a fraction. Fractions do not need to be in simplest form

In the diagram, point D is the center of
the medium-sized circle that
passes through C and E,
and it is also the center of the largest circle that passes through A
and G. Each of the diameters of the
small circles with centers B and F
equals the radius of
the medium-sized circle with center D.
The shaded area is what fraction of the largest circle?