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2.phi.r.t = 2112 cm^2
phi.r.t = 1056 cm^2
Volume tabung = phi.r^2.t
phi.r^2.t = 22176 cm^3
(phi.r.t.)r = 22176 cm^3
(1056 cm^2).r = 22176 cm^3
r = 22176 / 1056
r = 21 cm
Tinggi tabung :
phi.r.t = 1056
22/7.21.t = 1056
t = 16 cm