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r=1/2 a =3
H=a√3/2 =6√3/2=3√3
V=πr²H/3
V=3²*3√3π/3
V=9√3π [j³]
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Pc=πr9r+l)
Pc=3π(3+6)=9*3π
Pc=27π [j²]