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h=18cm
h=(a√3):2
18=(a√3):2
34=a√3
a=(34√3):3
Pc=2Pp+3Pś
Pc=2*((a²√3):4)*h+3*ah
Pc=2*8,5*18+3*204√3=306+612√3=2(1+2√3)cm²