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r=l/2
r=4cm
h=√3/2
H=8√3/2
H=4√3 cm
Pc=πr(r+l)
Pc=4(8+4)π =4*12π
Pc=48π cm²
V=πr²H/3
V=4²*4√3π/3
V=64√3π/3 cm³