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r=1/3h=1/3·a√3/2=a√3/6
2=a√3/6
a√3=12
a=12/√3=12√3/3=4√3
PΔ=a²√3/4=(4√3)²·√3/4=48√3/4=12√3 j²
odp: b)
Odp. B