Paulo 
In a recent post, you gave two different definitions of prismatic coefficient  one was not correct.
This one is incorrect  this one is the definition of block coefficient.
Quote:
Prismatic Coefficient is a mathematical measurement of the relative shape of the bow and stern of the boat. It displays the ratio of the underwater volume of the hull relative to a rectangular block.

And this is the correct one:
Quote:
We express the "full hull" property by the prismatic coefficient, which is the ratio of volume displaced to the product of waterline length and maximum crosssectional area.
