11. Ab=l² · √3/4 = 6² · √3/4= 36√3/4=9√3
Pb=3l= 3•6=18cm
h= l •√3/2=6•√3/2= 3√3cm
Al=Pb•h = 18•3√3=54√3cm²
V= Ab•h= 9√3•3√3= 81cm³
12. Ab= l² · √3/4 = 9√3 cm²
Pb=3l=3•3=9cm
h= l· √3/2=3√3/2
Al=Pb•h=9•3√3/2=27√3/2
At=2Ab+Al=2•9√3+27√3/2= 18√3+27√3/2= (36√3+27√3)/2 =63√3/2
V=Ab•h=9√3 •3√3/2=81√3/2
