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obwód postawy = 2π*r
14cm=2π*r / :2
7=π*r / :π
r=7/π
V = π * r² * H
V= π* (7/π)² * 45 = π ( 49/π²) * 45 = 2205 / π cm³
czyli: 2πr = 14
r= 7/π
V= πr² x h
V= π (7/π)² x 45
V=
V= 2205/π