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l=2×22×15×2
l=2320
luas permukaan tabung ( l )= 2πr^2+2πrt
l=2πr(r+t,)
l=2×22/7×10,5(10,5+20)
l=66(30,5)
l=2013
jadi luas sisi tabung adl 2013 cm^2