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Pp=a²√3/4=8²√3/4=16√3
H=wysokosc bryły=9cm
h=wysokosc podstawy=a√3/2=8√3/2=4√3
1/3h=4√3/3
k=wysokosc sciany bocznej
z pitagorasa
H²+(1/3h)²=k²
9²+(4√3/3)²=k²
k²=81+48/9
k²=729/9+48/9
k²=777/9
k=√777/3
Pb=3*1/2ak=3/2*8*√777/3=4√777
Pc=16√3+4√777=4√3(4+√259) cm²