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r=3,5cm l=7
Pb=πrl
Pb=π*3,5*7
Pb=24,5π
r = 3.5cm
H = 7√3 / 2 = 3.5√3
V = ⅓ × 3.5² × π × 3.5√3
V ≈ 74.3π / 3 ≈ 24.76π cm³
Pb = π × 3.5 × 7
Pb = 24.5π cm²