Help!! How to find the area of this shaded circle? (1 Viewer)

[rita286]

These three circles are drawn so that they
touch each other and their centres are all on
the line AB.

If CD is 8 units in length, what is the area of
the part that is shaded yellow?

PLEASE LOOK AT THE BENEATH LINK TO THE PICTURE OF THE CIRCLES!

http://nrich.maths.org/6323


Thanks