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P=l²/2
l²=2P
l²=2*9
l=√(2*9)
l=3√2
a=l√2
a=3√2*√2
a=6
r=1/2 a=3
H=1/2 a =3
V=πr²H/3
V=3²*3π/3
V=9π [j³]