b)
area totale A = 3^2*π+6*π*3+3*π*√3^2+4^2 = π(9+18+15) = 42π cm^2
volume V = 3^2*π*(3+4/3) = π*3^2*13/3 = 39π cm^3
a)
area totale A = 3^2*π+6*π*7+3*π*√3^2+4^2 = π(9+42+15) = 66π cm^2
volume V = 3^2*π*(7-4/3) = π*3^2*17/3 = 51π cm^3
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