luas selimut sebuah tabung adalah 440 cm² jika tinggi tabung 10 cm,Tentukan luas permukaan tabung tersebut
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Penyelesaian:
Ls=440cm²
t=10cm
Lp=?
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Ls=2Πrt
440=2×22/7×r×10
440×7/22=20r
20×7=20r
r=7cm
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Lp=2Πr(r+t)
Lp=2×22/7×7(7+10)
Lp=2×22(17)
Lp=44(17)
Lp=748cm²