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t = 10 cm
maka :
L selimut tabung
= 2.phi.r.t
= 2.22/7.7.10
= 2.22.10
= 440 cm²
Lp tabung
= 2.phi.r.(r+t)
= 2.22/7.7.(7+10)
= 2.22.17
= 748 cm²