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Vtabung = La.t
785000 = 3,14.50.50.t
785000 = 7850.t
100 = t
Lpermukaan tabung tanpa tutup = 2πrt + πr²
Lpermukaan tabung tanpa tutup = 2.3,14.50.100 + 3,14.50.50
Lpermukaan tabung tanpa tutup = 31400 +7850
Lpermukaan tabung tanpa tutup = 39250 cm²
Maaf kalo salah. Semoga membantu.