Proper quadrilateral prism (primary school)

Calculate the surface proper quadrilateral prism if the base edges 4cm and 8cm high.

Solved:

a=6cm                 M=3a*H           P=2B+M

H=8cm                M=3*6*8          P=2*9√3+144

B=a²√3/4             M=18*8            P=18√3+144 cm²

B=6²√3/4             M=144cm²

B=36√3/4

B=9√3