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81 cm² = a²
a = 9 cm
Pc = 2 × πr² + 2πr × h
Pc = 2 × π(4,5)² + 2π4,5 × 9
Pc = 40,5π + 81π = 121,5π
V = πr² × h
V = π(4,5)² × 9 = 20,25π × 9 = 182,25π