You can put this solution on YOUR website! how to find surface area of half of a rectangular prism
(1/2)Area = (1/2)(L*W*H)
------------------------------
and half of a right circular cylinder
(1/2)Area = (1/2)(circumference*height = (1/2)(2pi*r)h = pi*r*h
=====================================
Cheers,
Stan H.
=============