h_(основания)=H/tg30 ° =8sqrt(3)/sqrt(3)/3=24
L=h^2+H^2=24^2+8^2=640
L=sqrt(640)=8sqrt(10)
a^2=6^2+24^2=612
a=b=sqrt612)=2sqrt(153)
S_(полн)=S_(бок)+[blue]S_(осн)[/blue]=(1/2)*2sqrt(153)*8sqrt(3)+(1/2)*2sqrt(153)*8sqrt(3)+(1/2)*12*8sqrt(10)+[blue](1/2)12*24[/blue]=
=144sqrt(31)+48sqrt(10)+144