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(78π-60π):2 = 18π:2 = 9π
promień podstawy:
πr² = 9π |:π
r² = 9
r = √9
r = 3
wysokość walca:
60π:(2π*3) = 60π:6π = 10
V = Pp*H
V = 9π*10
V = 90π cm³