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2√3 = 1/2*a²*√3
4√3=a²*√3
a²=4
a=2
Pp= π*(2√3)² = 12π
V= 1/3*12π*2=24/3π=8
Pb= π*2√3*4= 8√3π
Pc= 12π + 8√3π