different boob sizes
 

can anybody help me with the different sizes of boobs....that are talked about.
what is a cupA1 or cup DD or cup D4......and so on....what is the length (radius) of the breast tissue for each cup size both on the upper side as well as the lower side from the nipple?????
and what will be the cup size for 6 cm radius up and 5 cm radius down.