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120 = 4 . pi . r^2
r^2 = 120/4.pi
r^2 = 30/pi
Luas permukaan tabung = 2 . pi . r ( r + t )
Lp tabung = 2 . pi . r ( r + 2r)
Lp tabung = 2 . pi . r^2 + 4 . pi . r^2
Lp tabung = 2 . pi . 30/pi + 4 . pi . 30/pi
Lp Tabung = 2. 30 + 4 . 30
Lp tabung = 60 + 120
Lp tabung = 180
cmiiw........