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2.phi.r.t = 616
2.22/7.r.14 = 616
44.2.r = 616
88.r = 616
t = 616/88
t = 7 cm
jadi,
L sisi tabung
= 2.phi.r.(r+t)
= 2.22/7.7.(7+14)
= 44.21
= 924 cm²