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1800 = 15 x 6 x t
1800 = 90 x t
1800 : 90 = t
20 = t
L = 2 x [(p x l) + (p x t) + (l x t)]
L = 2 x [(15 x 6) + (15 x 20) + (6 x 20)]
L = 2 x [ 90 + 300 + 120 ]
L = 2 x 510
L = 1020 cm2
maaf kalau salah,,